I use the ones in my sig except the Super-T which isn't here yet. Currently, it goes something like this:
Driving, I use the AdapteveR or a full cart on a BE112 the Prodigy or GG. Watching a movie, BE112 on the Prodigy. All day at work? Dripping the 901 on the GG set up for six volts with with CR2's or RCR123A's. Trying new flavors? either the AdapteveR with the 510, or The Copper with an RN4081.
I just got the Silver Bullet today, but I can already tell it's going to be my new tobacco flavored juice PV. 510 at six volts rock for this. You can actually take mouth pulls then inhale. Works amazing if you don't overdo it and get the 510 too hot.
When the Super-T gets here it will be for M201 dripping use.
Best Vape? Hard call. I'll still give a nod to the BE112 on the Prodigy at 5 volts, but damn if I'm not falling in love with the 901 on the GG. Also, the RN4081 absolutely rocks on The Copper. It's like a baby 801. The cart is a massive pain in the ... to refill, so I usually just drip it but it's also great for movies and TV, or when working because of the awesome mouth-push button.