I've had an '86 Full Size Bronco with the 302 since 1987, it has 180K on the same engine and transmission, replaced rear axle/front hubs/re-geared/suspension work/body mounts and various bushings, is about all it has needed. It has been a very durable machine, the 302 and AOD is a good and reliable powertrain. The 302 is problemmatic in that it uses the speed-density EFI, so forget about much engine modification ie head, intake manifold, cam, computer without changine the EFI to mass air-flow or throttle body. The mustang guys have made an existence out of beefing up the 302 with impressive results.
I also have a '87 FJ60 with 164K on a rebuilt 2F and original 4sp, I've had it for 3y and about 30K mi.
The two are worlds apart. The 302/AOD requires virtually no maintenance; the 2F requires constant albeit small adjusting. The Bronco is much nimbler with the shorter wheelbase; the 60 is much smoother on and off the road. The 302 also carries the Bronco much easier than whipping the 2F through the gears. The twin I-beam Ford suspension is a classic mistake by Ford. The solid axle in the 60 is still the strength and reliability standard even today.
They both rust.
The back seat is more than a pain in the Bronco, as is access to the rear compartment. The 60 wins multiple hands down for ease of rear seat and hatch access ie extra people or cargo.
The biggest difference I see in two trucks of similar vintage and mileage is the quality. The Bronco is a rattletrap. I spend an enormous amount of time tracking down the latest squeak or rattle in the dash, windshield, back, suspension - seems like a bunch of parts in formation at times. The 60 remains rattle free, like every Toyota I have owned (7 and counting over the last 20y, all trucks). It just feels so much better put together. It is a pleasure to drive even 20y later. The Bronco, after an hour or less, wears me out.
If your needs are family access, cargo, comfort and you don't need to go anywhere too fast and don't mind tweaking, the 60 is your bet. If you are interested in more nimble, quicker on the road, shorter turning radius, fairly trouble free powertrain, the old Broncos are tough to beat, they don't make anything like them anymore.