Don't get me wrong, I love my FJC. It's easy to look back and find things that one might do differently. I really don't have any regrets (well, maybe the yellow Wet Okole seat covers, not quite as yellow anymore), how could I, it has everything but a TRD supercharger.
It's a perfect set up for 2 plus the dog, bottom line is the clamshell doors. I've adapted and like it, being able to get out, get the dog out of the back from one spot. Some hate it, back seat passengers can't get out without having to have the front door being opened first. That means having to release my seat belt, open my door so the clamshell can be opened. They can't get out the passenger side without having that front door opened first.
Doing some relatively extreme sections, I had to have a "safety briefing" with a plan how to get out if we rolled or ... The back door or window can't be opened from the inside either, making for potential to have the back seat passengers being trapped in the back. Adding the dog barrier in the back makes a nice cage further trapping the rear seat passengers in the event the front doors become disabled or the front passenger can't open the door.
There is a way to make a rear door release as well as one for the rear window although I've not done them personally. In either event, I guess my paranoia and overly analytical brain makes me think this is a safety issue for back seat passengers. I'm not trying to be alarmist, just honest about my thoughts thru almost 5 yrs of ownership, having my daughters growing up in the back of it.
Obviously, anything can happen in an 80 also, there are simply more options of something "bad" happened. The weakest issue for the 80 is the power plant, particularly with 35's. I'm planning on a regear and I'd consider a supercharger to help it drive well at 70+ mph duties as a daily driver.
When I (really, we) look back at pure dollars and "sense", spending similar $$$ on a nice 80 as a base, it would be an over-the-top rig (just like my FJC) without the additional $15+k difference in initial vehicle cost.
Hope this all makes some sense...