At the time that you are there, the SB line for TT will build to 60+ minutes within the first hour of park operation. Unless you plan to rush to it first thing in the morning or use the Single Rider line, you would be advised to use a FP for it. But note that if you do, you won't be able to use one for Soarin' and you will be left with the same dilemma there. You pretty much have to ride one immediately upon park opening and use a FP for the other one.