Which would be more useful?

Dr Strange level magic abilities (travel dimensions, summon demons and whatnot, flight, astral projection, etc)

or

Xavier level telepathy (read or control minds of everyone on the planet)

or

GL ring (space travel, create anything you want, etc)

or

Flash level speed

I would choose different ones based on my need of them....but id go with flash level speed- i wouldn't need to worry about transport to anywhere, anytime. telepathy or GL ring would be great too but I'd choose the ring over telepathy. I don't care much for Dr. Strange's powers

Probably telepathy, it would be the most handy dandy in day to day life. Psychic absorbstion of knowledge from pretty much anyone.

I'll take Strange's powers in a heartbeat. Cant mess with mastery of the occult, as it has all of the other listed powers, but in a lesser degree.

I would take a GL ring over all of them anyday. Man just imagine wat u could do with it! Theres just so much that u could do! And it would also let u travel space wich is a big reason to why i'd choose it.

GL ring or Dr. Strange powers...maybe Strange's would be a little more useful

Flash speed would allow cool adventures that absolute killing power would withhold.

I'd have to go with X's mind control powers...after that probably Strange's powers