I've got the Griffin, Mutank, Mutation x rta, Aromamizer, Cthulhu v2, Crius and the Bellus. The Bellus is overrated, but if you have any of the other tank's you really can't go wrong. But the Griffin is the stand out rta at the moment. Also if you like a larger juice capacity you must add the Vcmt 25mm and 30mm in to the mix.
As for subohm tanks I love my Crowns, the Herakles plus is really good when it's not leaking. The Tfv4 has the least efficient coils known to man kind but if you wanna carry a bag full of juice and batteries around with you all day then that's the one for you. My all time favourite subohm tank is the Tobeco Super Tank Mini with an Aspire Clapton coil.
I'm waiting to see where the latest run of ceramic coils ends up before I try one. I'm leaning towards the Vapeston Ceramikus at mo. But most modern rta's and subohm tanks are really good.