I saw both Volume 1 and 2 on same day, downloaded first one, watched, went to theater only minutes after finishing it, and saw the 2nd one.
Because of this they both kind of blend together for me (and because Tarentino wanted it to be one movie, but it was too long).
Both are great movies, but not if you have a weak stomach, the first one especially had a great deal of exaggerated blood loss - hilarious though, but could upset some stomachs I'd imagine.
There's more plot development and dialog in the 2nd one, but I thought ending was a little predictable.

-Georgio