Mythra

Superspeed is like 83 mph cap, Fly is like 43 mph (I think or maybe 53). There's a dev post on it somewhere.

Last I timed flight, around level 27 or so, with 1 SO speed, I was going 32 mph.

In any case, superspeed is much faster.

Fly is great for getting out of a bad situation fast. So is jumping, but if you're getting hover, you might as well take fly as well, and save some skill points.