My cousin had numerous automatic transmission failures, bad door fitment, and similar on his several Blazers. I have only auto parts store and wrecking yard experience with the Blazer. Some were ordered with dual front shocks. The removable hardtop is interesting. Probably most easy to find parts for.
I've had some experience good and bad with the two Ramchargers I've driven, and prefer them over the similar Blazer because of other Dodge fullsize trucks I've owned. The Ramcharger is available with a 34-gallon fuel tank and the afore-mentioned Cummins will generally bolt in...along with all the other 1-ton goodies.
I have seen many Bronco fullsize in wrecking yards and they have not had door hinge issues that plague the Chevy and Dodge platforms. The early to mid-90s F250 Dana 50 TTB axles are an interesting upgrade for the Bronco. The engine bay would hold a 7.3L diesel or 460-gasser. If you're up for go-fast parts, the sky is not even the limit for this chassis. Total Chaos makes a long travel front suspension kit. Numerous fiberglass replacement parts are available for fenders, hood, doors, rear quarter panels. The rear top is removable, so you could install a truck camper if desired.
I like an expression I've read elsewhere: "Dodge, built Ford tough with Chevy parts."
Some is choice. I'd have a Ford if not for my Dodge.
Russell