4wd questions

[1971 cheburban]

What is the best of the best 4 wheel drives, a chevy or gmc. They're basically the same right? And what is the best axles, i know the Dana 60s,14 bolt, 10 bolt and all thy jazz, but what is the ho52, and any other ones I've missed? Is there a 12 bolt front axle? I'd prefer 6 lug and a half ton spring setup for ride comfort but I'd go with a 3/4.I know the 205 is one heck of a t-case but what is the t-221, NP or What??? Are they hard to find and what kind of parts availability? I've heard some adaptor trouble with the 221, also what do you guys think is the best driveline for a 4wd, I'm thinking hot rod 292,sm465,205, Dana 60 rear, 10 bolt front, lockouts, or 396, sm465,205 and 14 bolt rear, Dana 60 front, lockouts, but then again a big block is for smoking tires, but then again it would a monster, any thoughts or input is appreciated