I think Team Two wins 6/10 my reasoning is simple...
1. Thanos = DS I think Thanos is a tad bit higher because I don't see him losing to some of the people DS has. However, I think they are basically equal and for the sakes of this we'll call them equal.
2. Super >= Thor. I think Thor is more versatile and has more power output but supes is fast and better at h2h fighting which gives him the ever so slight edge.
3. DS >= to Supes. I think Supes can beat DS but more often then not DS should win
4. Thanos > Thor. There is no equal because I feel Thanos has shown his clear superiority of Thor without too much trouble. Thor is tough and can hurt Thanos and give him a good fight but not win.
To me this fight comes down to the fact that Supes can and has hung with DS on numerous occasions. He's done better against DS then Thor has against Thanos. I see Thanos fighting Thor first and getting the better of it after a good battle while Supes holds off or barely losses to DS. Which leaves Thanos fresh or in better condition to finish of Seid. If Supes goes after Thor I believe he wins that fight after a great fight more often then not. SO, while Thanos and Seid battle to a virtual stand still supes will finish of Thor more times then not and before Thanos and DS finish as they are pretty equal. He'll then come in to finish it off. No matter the matchup I see Team two winning an ever so slight majority.