I have the RTF version with the Tower .46 Pro engine & it runs & flys excellent. With an APC 11X6 on it, it pulls real good & with a 10x8 as Tower suggests it still pulls pretty good & has real good top end speed. Given the two choices you put up I think I would try the Fox .45 if it runs good I think you will be happy with the extra little boost. Especially since you already know how to fly & are just looking for a fun type Trainer. You'll like the Tower. It shreds the sky real well & is pretty stout too. It can take some abuse. Have fun with it, I still do.