Did you decide on your stance yet? I'm a lurker who is considering moving out of my STi to a GX or an LX. I know someone mentioned profile, but when I swung by the dealer today, they had the LX and the new GX next to each other, and, to be frank, they look the same size. Like, less than a 10% difference. I can't imagine the extra 4" of width make a great deal of difference on the trail, but I dunno.
I am pretty certain that the OP ended up in a LX570. We have both the LX and the GX, both are 2019 models, here is my takeaway (keep in mind this is strictly comparing the 2016+ GX and LX).
GX
Pros
Better fuel economy
Easier to park and run around town
Better size and weight for trails/off-road
65-70% of the price of the LX (new vs. new)
More aftermarket options and interchangeability with the 4Runner
More availability both new and second hand
Everything we all wish the 5th Gen could/should be
Cons
Smaller than the LX
Cramped cargo area due to raised deck for third row
Average to under powered for a V8
Dated interior and tech
See them everywhere (at least here in Texas)
Horrible bumper options
Low residual value compared to the LX
Cabin/interior not as quiet or refined as the LX
Not wonderful to tow anything sizable or heavy with (over 3,000lbs is meh)
Weird rear barn door
LX
Pros
Good power and transmission
Great size and interior space
Good luxury appointments
AHC
Don't see them everywhere
Can be bought new with deep discounts
Split lift gate and tailgate
Tows 5,000lbs respectably well
Cons
Pricey even with discounts
Heavy
Dated tech
Funky front spindle grille
Very little aftermarket
Horrid fuel economy
If I could only have one it would be the LX. If I wanted to keep it for more than 3-5 years and found myself driving at least 50/50 on road/off-road or more towards the on road side of things I find the LX to be the better choice. Both can work for those with kids because they have third rows but the LX has more room and would be the better choice in that regard. For those that want to build a capable off-road vehicle and have no kids to a small family and might even be more budget focused then the GX wins. It has better aftermarket parts/mods availability and with their recent spike in popularity I suspect that market will continue to grow and blossom here in the coming years. A clean, late model (3-4 years old), low milage GX can be had for under $35K all day while the LX will run you nearly double that.
With all of that said, we have decided to mod our GX over the LX simply because of the available aftermarket and because it's size lends itself to be a better option off-road. It gets better fuel economy and will be easier to unload modified than the LX. I can't say just yet whether or not we will keep the LX for the long haul but if we do it'll get some sliders, a BMC and some BFG 35's and be reserved for light off-roading and camping. In all honesty, it's horrid fuel economy and lack of aftermarket are the two biggest reasons why I have yet to commit to keeping it for the long haul. For those that simply want to keep their vehicles stock or close to stock, the LX is a great option for a long term vehicle if you can accept its fuel economy.