I would go to Soarin first and do one of two things: if the line is long and you can come back later, then get a FP. Then go see Turtle Talk, which does not have FP.
Or, if the line is short enough at Soarin then just ride it. Then do Turtle Talk.
Either way I would do Soarin first.
Be aware that Turtle Talk only shows so often. I do not know the times. When we were there mid-August, it showed three times an hour in the afternoon but only once an hour in the evening when there were less people waiting to see it. It lasts about 20 minutes. We thought it was really cool.
If you have not been to the Animation Studios at DCA (where Turtle Talk is located), this is all OK becuase there are several other fun things to do there before seeing Turtle Talk. We spent 90 minutes there, and could have stayed longer.