of course in theory the 70d is better, its got more fps, 7 as opposed to around 5.3-5.8fps, 19 focus points as opposed to 9.
But that in reality makes no difference to the person behind the lens.
I shoot motorsport with 60D's and have no problem, i've also shot motorsport with the mrs 1100D on a trackday I was on and that only has 3fps..
Its how much money you want to spend and if you think the extra bits are worth the money