The black one with all the adapters. I've been using a silver bullet at 6v and a 510 atty but the juice taste burnt frequently. I'm hoping at 5v the 510 will be better for me (only because I have 40+ new attys sitting here). I ordered all the adapters and a few other attys just in case though. Who knows, maybe 801 and 6v will be the right "perfect vape" for me, this seemed like a cost effective way to try and figure it all out and I can put all my extra gear in the "stash" drawer for the great unkown. I know I really like my 510 on a 5v passthrough and I like the 808's as well at 5v. I like the idea of the green cig but the taste of the stock juice is mindblowingly bad and I can't get rid of it no matter what, so that one is out at every voltage. I should have it before xmas but my mailman doesn't really deliver in the rain so I'm not sure how he is going to feel about this two feet of snow on the ground here in VA....
I've been using the XHaler with a 510 as my primary Vapor Production device. My avatar is a pic of me vaping Drewbacco-1 on a 510 atty at 5v with my Black Carbon Fiber XH. My head is supposed to be right behind the XH, but is lost in a sea of vapor Kept this pic from my third try as it shows a tiny bit of hair on the right side of my head (left side of pic) to prove I'm really there, LOL.
It's smaller and a lot lighter than my SB, and my PS 5v USBPass doesn't sport quite the range I got all of the adapters and attys also and I enjoy vaping all of the different types. I always end up coming back to the 510's for the mountains of tasty vapor they give at 5 volts. What can I say, I need to have a lot of vapor Hope you enjoy yours as much as I am enjoying mine...I'm pretty sure you will