4x12 for recording, G12T or V30?

It depends on your preferences... I noticed I like more the g12t (and the way I mic it) for the sound I usually like for guitars....but it depends also on genre.
There isn't a single rule for these things...sometimes g12t is better and sometimes the v30 is better... best solution is to have both
 
I have and like both. I was first recording with the gt75's and I still like them now I've got a cab w/ v30's.
I find the greenbacks to be the under rated metal guitar speaker. Mightn't be the best for very fast stuff but they are very big sounding and sound huge on stuff thats a bit slower