The TT .46 Pro is more user friendly, is built to a higher quality standard & is fundamentally more powerfull. The Tower Hobbies .46 & the GMS .47 are the same motor (despite the "47") & both will slightly out power the TT with the as-supplied mufflers, however, if you put the GMS/Tower muffler on the TT .46 Pro, it will blow the other two away.

Go with tthe TT.