That's a tough one, they really both have great stuff.....
I have found that my v4l premium cartos don't work on the volt batts....but my volt cartos CAN work on the v4l batts!! My fav is a diamond auto v4l batt with volt cartos LOL. I like the volt cartos better, they are horizontal coil and not vertical coil. I can add a little more
juice in them than the vertical coil volt cartos. They seem to have better flavor, last longer, and they are resistant to burning. My second fav for 808 cartos are the v4l cartos - premium. I prefer the cool premium cartos over the wow. I don't like too hot. And I just think they are better. But a lot of ppl prefer the wow ones so what can I say...
As for the
batteries I slightly prefer the v4l batts over the volt. The v4l batts to me are easier to draw on. They are airier....but the volt having a sealed auto is pretty sweet. And now you can
buy diamond end caps to add to them and they are so inexpensive. But I also prefer the look and feel of the metallic colored v4l batts over the look and feel of the volt batts. I personally prefer auto over manual but I have both (mostly auto for my 808s).
If I was to do a list and mark them up for which is best for what, they would come out with a pretty equal amount of points I think lol. They both are great.
Both companies have great customer service as well.