I have owned both an 80 and 100 and only recently sold the 80. The 100 was intended to be a replacement for us from the start. Impressions from while I owned both:
The 80 was rugged, reliable and rarely left me wanting except: in the winter when I ran the ventilation because everything always fogged up (you can leave your AC engaged which helps clear it up and recirculate the air instead of using fresh air); when I wanted to make an extended road trip (70+ MPH for an extended period is a good bit of work for an 80, the skinny pedal gets work out); when I wanted to tow something (anything really, unless you are on flat ground below highway speeds). I personally found the drivers seat to be the most comfortable seat I have ever had. I found that not having locker was never a detriment off-road. The factory roof-rack was useless and a rust magnet waiting to happen. I would pine to drive the 80 when I hadn't for awhile and in almost every case it was just me. My wife and son always prefer being in the 100.
The 100 is just as rugged and reliable. It has yet to leave me wanting except when I had it "lifted". I had the AHC removed and replaced with an OME 2.5" lifted conventional suspension (personal preference) and getting the front raised is a pain compared to a solid axle truck (cranking the torsion bars is an in-exact science). It cruises at highway speeds easily and comfortably. It tows my small camper like it isn't even there (the main reason for the switch). It stops better. Off-road it is more a matter of finesse than brute pedal mashing. In the same locations where I used to just mash the pedal and hope for the best with the 80, I crawl and creep (even towing the camper) because A-TRAC is some magical unicorn shiz. Most of the time you won't know when it kicks in because it just works well. On a road trip this thing is king. While I still feel the drivers seat was more comfortable in the 80 (again just my preference), all of the other seats in the 100 are more comfortable than their counterparts in the 80 AND the middle row reclines
. With rear AC the truck cools down much faster overall in the summer and I have yet to experience interior window fogging in the the 100. It is much quieter inside. Also while it isn't dramatically larger than the 80 (sitting next to each other there is little difference in size, with only the width being noticeable); it feel HUGE compared to the 80 inside. The roof rack is still useless garbage.
Recommendation:
For overall comfort and usability and based on what you stated you need the 100 is going to be the way to go. If you were building a trail rig then I would recommend the 80; not because the 100 is not as capable (in my experience) but because the 80 easier to modify, slightly narrower and a little older tech (which almost always translates to easier to maintain). The creature comfort level is higher for the family in the 100. If I didn't need to tow on road trips I would never have given up the 80 since it met every other need and I seriously dug the look and feel of it. One other factor to take into account as I wrap this up; each generation of Landcruiser will experience this, the longer that series has been out of production the harder parts are going to be to find. The 40s group felt it, and 60s guys too, this is starting to creep into the 80 community. Currently we aren't too far removed from 100 series production and in the US in particular they sold better than the 80 series between the LC100s and the LX470s. They also share some parts (engines mainly) with the Tundras.
The 80 was rugged, reliable and rarely left me wanting except: in the winter when I ran the ventilation because everything always fogged up (you can leave your AC engaged which helps clear it up and recirculate the air instead of using fresh air); when I wanted to make an extended road trip (70+ MPH for an extended period is a good bit of work for an 80, the skinny pedal gets work out); when I wanted to tow something (anything really, unless you are on flat ground below highway speeds). I personally found the drivers seat to be the most comfortable seat I have ever had. I found that not having locker was never a detriment off-road. The factory roof-rack was useless and a rust magnet waiting to happen. I would pine to drive the 80 when I hadn't for awhile and in almost every case it was just me. My wife and son always prefer being in the 100.
The 100 is just as rugged and reliable. It has yet to leave me wanting except when I had it "lifted". I had the AHC removed and replaced with an OME 2.5" lifted conventional suspension (personal preference) and getting the front raised is a pain compared to a solid axle truck (cranking the torsion bars is an in-exact science). It cruises at highway speeds easily and comfortably. It tows my small camper like it isn't even there (the main reason for the switch). It stops better. Off-road it is more a matter of finesse than brute pedal mashing. In the same locations where I used to just mash the pedal and hope for the best with the 80, I crawl and creep (even towing the camper) because A-TRAC is some magical unicorn shiz. Most of the time you won't know when it kicks in because it just works well. On a road trip this thing is king. While I still feel the drivers seat was more comfortable in the 80 (again just my preference), all of the other seats in the 100 are more comfortable than their counterparts in the 80 AND the middle row reclines

Recommendation:
For overall comfort and usability and based on what you stated you need the 100 is going to be the way to go. If you were building a trail rig then I would recommend the 80; not because the 100 is not as capable (in my experience) but because the 80 easier to modify, slightly narrower and a little older tech (which almost always translates to easier to maintain). The creature comfort level is higher for the family in the 100. If I didn't need to tow on road trips I would never have given up the 80 since it met every other need and I seriously dug the look and feel of it. One other factor to take into account as I wrap this up; each generation of Landcruiser will experience this, the longer that series has been out of production the harder parts are going to be to find. The 40s group felt it, and 60s guys too, this is starting to creep into the 80 community. Currently we aren't too far removed from 100 series production and in the US in particular they sold better than the 80 series between the LC100s and the LX470s. They also share some parts (engines mainly) with the Tundras.
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