By "V3", I assume you mean the Prodigy V3. [There is also a Joye Stick V3 and probably others.] Hopefully someone here has the Prodigy. If not, I'll share my own experience:
Most of my
vaping has been done using adapters. You see, I like the penstyle-type atomizer (e.g., 801), for which very few
mods have fittings. [The Prodigy is an exception; I think because Steve likes the penstyle atty.] So the 901-to-801 adapter has been a godsend for me. I use it with Kr8
batteries, my ProVape-1, and with my Elegant. And (since I don't have an eGO) I even use a 901-to-510 adapter for an LR 306 on my Elegant.
And most of these adapters are
very inexpensive, e.g., $1 at
Good Prophets.
If a Prodigy user does not chime in, I suggest that you purchase it with the fitting for your favorite atomizer and buy a couple of inexpensive adapters for the others. Worst case: you're out a couple bucks.