Are A bodies more popular than B bodies?

Lol, Way back I traded my '71 Challenger RT 340 car for a front end damaged '69 Barracuda S with a 440 (383 original) and an old TB Dodge '66 Satellite track car. If I knew then what I know now, I'm thinking I'd still have an orange Chally. :D

A '69 (and '68) 383 RR was supposed to come with a .020" positive deck engine, with .019" head gaskets, and 906 heads. Many however will dispute the deck dimension. My '68 RR (back in '75) did in fact have this, although I cannot provide proof of that today. It was touted as cheap power back in the day. Were it me, for similar condition vehicles, unless the "A" is some special package car, I think I'd stick with the RR.

The 1970 Hamtramck Registry - 1969 Plymouth Dealership Data Book - Belvedere (hamtramck-historical.com)