A few weeks ago, we arrived EPCOT @ 9:30am (30 minutes past rope drop), waited only 10 minutes standy-by for SOARIN and then went to TEST TRACK for our 10:30am FP+ reservation. When we got off SOARIN, the standy-by wait was 40 minutes. After riding TT, we walked past SOARIN again and the stand-by wait was 70 minutes. Needless to say, although we were not at park for rope drop, we couldn't have timed it out any better. My vote is to FP TT, but I guess it depends on how early you get to the park and attempt to ride SOARIN.