Cheetah has always been faster than Diana, even golden age Cheetah who "had no powers" was said to run 70 mph.
(...although in Wonder Woman's first appearance she was sprinting at 80 mph, but then Marston retconed that issue, sort of, so who knows!)
I mean, it's all silly to begin with that an alien who gets his powers from the sun is in anyway stronger than a god.
But in the end, I don't really care if WW is a little weaker that Superman because they gave him like, 20 physical weakness and she doesn't have any (anymore).
Plus, I mean...it really doesn't matter who should be stronger. They all have impressive feats and they all have power levels that change for the plot.