Uppers is quite powerful w/ Jackie Cr, Dorian, Lady, Herman, Hefty, Glenn, etc.
Sakrohm is also strong w/ Stella, Graks, Uranus
Skeelz got a solid lineup w/ Caelus Cr, Michael, Dwan, Minerva, Tomas, etc.'
Ulu Watu is great T2 w/ Tan Man, Serena, Stanly, Wee Lee, Lulabee, Miss Lulabee, Oraya, Hikiyousan
Sakrohm/Uppers with Morphun to me is the most optimal t2 survivor deck out there as of right now. I find myself starting every preset with Morphun, GraksmxxT, Uranus, Virginia, Jackie Cr, Lady, and Maurice. The last slot is really just a personal preference since I don't own Guru Cr as of now, but if I did, I would consider that last staple in the deck. So, basically I personally think there is no better deck to play in survivor than the one I just listed, simply because of its versatility. Other strong clans for Survivor are the Skeelz, Sentinals (for those who are on a budget) and possibly Junkz if you own DJ Korr Cr, if not, I really wouldn't bother with them. Hope this helps.