I would go with TT, and hit Soarin' right at rope drop. The line builds quickly, so you have to be right there, but then you can get that out of the way. TT seems to have much more of a delay quickly, we had some friends get in the single rider line right after we rode Soarin' (about 9:15), it said 20 minutes, it took them 35.
TT and Soarin' both have FP+ at opening, but Soarin' can allow a lot more through more quickly than TT can, so I think that is why TT seems to jam up right away.