I do the same, they ware out about the same time. Dual Motor tail is way to go thought. I fly a lot better with dual tail. actually my first successful hover was with first time flying with dual tail.
Only thing is if you crash and stall the motor both could dies at once.
I tried direct drive, for some reason they didn't work for me so went back to Dual Tail. I got the all heavy one, I didn't do enough shopping around i guess.