There isn't a best clan, all clans have their good and bad sides. Some needs subtract from others. It's all about you'r idealism. Me, I personally like GHEIST and Roots. Their stopability of well everybodies ability makes them a very effective tribe for me. Nightmares stop bonus is also nice when it come to cards that are difficult like Montana, Uppers, such. but find out what mix od cards you like and feeli ti thrugh for yourself.
The Urban Rivals team is made by lovers of all kind of Collectibles Cards Games and Trading Cards Games like: Magic the Gathering, Dominion, Vampire, Yu-Gi-Oh!, Pokemon, Wakfu TCG, Assassin Creed Recollection, Shadow Era, Kard Kombat and Might & Magic Duel of Champions.