Normally I say that a battery is just a battery, some are better than others of course depending on what you want to do with it.
What device you attach can make a big difference also.
I started off with a variable volt batt. I used my V4L & KGO batts exclusively for 2 weeks just to see if I would really miss my VVPV. At first it wasn't a big issue, but as time went by, I really missed being able to dial the juice to taste.
I will never be without a VVPV as I have 3 Lavatubes now and a ProVari in my near future.
The wife has put her V4L batts back in the box, I think she wants to give them to a friend.
She has been happy with the vapor time from her larger batt, but I think she would look good sporting a iTaste
