The problem is that only the Black got the rework, the Red and the Blue will probably stay the same for what we know right now, and the cargo hold of the new Black will be a little larger from the "latest" news, it has (as you can see in the images below) 9 crew post (pilot, co-pilot, turret and 6 seat), 2 lateral big doors (always images below), a big room also for the crew with beds, lockers, and more lateral doors (always images below).
So imo, the Black will be probably a better deal if they will not rework the others (this is also why the Black will cost more $$$)..
****edit: Source of the pics if you want to see more
View: https://imgur.com/a/8Clyz#AGlHd80