Both are rare. Both are awesome. Both will get down most trails.
I'd take a troopy since I have a family.
I'd take a 43 because its a 43
Both are equally rare and will resell well. I'd love the info for the one you don't buy.
I'd pick the most original, complete one with the least amount of rust. That said:
Do you have a favorite?
What years are they?
Are they both titled in the USA?
Mileage is less concern to than proper maintenance.
How do they drive?
If you are looking to wheel it and hit tougher trails and lift and lock it, the 43 wheel base will prove better off road on tight trails. If you want to drive to Alaska hitting fire roads and dirt roads, I'd be all over the space of a 45
Good luck, sounds like you're stuck between a cool truck and a cooler truck... Your choice.