I don't believe I have a favorite, per-say. I have a favorite for certain situations.
My favorite clan is the Fang Pi Clang... But they positively blow when in my clumsy, foolish hands. I cannot use them, I swear to God, and I love to play with them. They are never banned, they have good cards, I just can't make them work right.
Favorite clan for DT? Bangers. So many good 5-stars to run wild on T2 with. And I have a majority of the collection, minus the CR's.
My favorite clan to elo? Rescue and Montana. The bonus makes a victory fairly easy, you just have to be sure not to muck up whats right in front of your face. And they don't seem to have much problem against Nightmare and Pirana decks either because most of them have good abilities, too. Rescue has all of it's staples banned and still has amazing decks to build every week. And Montana cards are nearly never elo-banned, strangely enough. I guess Hugo being banned takes some of their thunder away, but I have no problems building decks without him in them, still.
My Favorite clan overall Is probably Rescue followed closely by Jungo and then Gheist.
I'm working on Nightmare also.
I love rescue and win or lose, I just always go back to them. I think, to me, they are just fun to play.
This might also be because of my limited funds and lack of cards for all the rest. I only have full decks of the above mentioned cards and the only good decks are Rescue and Jungo,
UR is so much fun