My favorite atomizer/RDA/RSA is the B2K, I have 4 versions, the KRNK version, the Caviar version, the v4 and v5. I really like a postless deck, for me it's the easiest way to build. I also really love all the different cap and ring options, so many ways to customize your RDA. It's like having several rda's in one. AND THE FLAVOR! Man I sure love love the flavor with the b2k RDA.
And all the popular after market cap manufacturers make caps for it also. I've tried the NN caps, but the Squonk Donkey b2k cap improves the vaping experience dramatically. I have 6 Squonk Donkey b2k caps, different colors and with Beauty rings and drip all made and designed by Tyler Hargrove. I can't say enough good things about Squonk Donkey and their Caps!! Here is a picture of some Squonk Donkey b2k caps.
Favorite RDA of all time for me goes to the 454, I started on that and used it soley for almost 3 years. I still build it from time to time. But I've been using the shit out of my 502 and Citadel. I just got my Jenna but I haven't been playing around with it a lot to really dial it in.
RTA has got to be the Lotus by Hugsvape but my QP Jugg Mini and Gear are replacing that slowly.
I have the Jugg Mini too. Great flavour. But I've been using the new Gear RTA a lot and the new Dear Rabbit RTA - both stellar. My 30+ fav is the Helo by far. Better for me than the Fatality.
For RDAs I love the new Goon 25 and the Apoc 25 - in fact I love all the Apocalypse RDAs.
Funny you should mention the B2K. I see Albert Lee at least three times a month and have been seeing him for four years (Albert makes the B2K). I almost buy all my gear from him. Everything he touches is gold. He makes great coils too.