Surprised to see the general consensus on here so far is United over SEM. SEM were better last season, and have a more talented roster in my opinion. On top of that, they got would should be a very decent upgrade in coaching (finally).
When I look at United I see a team that is going to struggle to score often. There's really only 1 proven player on the team to start the season that can consistently create his own offense (CG43) until JLA is back. The rest are either (mostly) non-scorers or shooting specialists. Even with JLA back, he's going to need to score 30 PPG for them to stay afloat. There is a clear lack of wing defense with size on this team. Travers and either CG43 or Clark are going to be playing heavy minutes guarding guys like Creek, Wiley, Hogg, etc.
On the other side SEM have one of the best players in the comp in Creek, one of the best 2-way bigmen in Williams, and 2 guards that can create their own offense when needed as well as set up others in Browne and presumably Cummings. Top that off with 2 great wing defenders in Moller and Kenyon, an extremely solid backup big in Vague, and a wildcard in Gak makes them a clear front runner in my book.