Uppers , montana , sentinel and rescue do naturally well in dt since they're so easy to use and have some really nice 2hko options. But its not too hard to do well in dt with other clans.
There isn't a very very best deck out there, but it is probably something along these lines:
Keep in mind, if you want to actually win a DT, you're gonna have to try for a very long time. It's extremely rare for people under level 50 to win tournaments.