I used to play mainly piranas because of the amazing pill manip but then switched to vortex for the same reason and after a lot of experimenting with a lot of clans, i am now using berzerk because of the wide variety of standard cards
I use the skeelz cause of there great synge together and the play mind games on my oppent with wonderful abilities and they have alot of cards that you can yous in low pillz fights.and i use frozn because of there bonus and regular abilities too also with there high power
I like to use Skeelz because they can be a great supporting deck due to their bonus. I sometimes only use 3 of them in a half deck so that I would get the other clan's bonus more often. However, their 2* aren't too good. Only one I find usable is Redra, hopefully a good one will come out soon.
I also like La Junta, despite what anybody says. I like their abilities and high damage (mainly due to bonus). I just find that if they were to lose their abilities or bonus, they would be affected quite significantly.