Who in the Harry Potter universe is as powerful as Doctor Strange (MCU)

Who is?

Hard to compare to be honest, top tier wizards like Voldemort probably have greater destructive capacity, but also don't have Strange's BFR. I suspect probably only the big 3 (Dumbledore, Grindelwald, Voldemort) would beat Strange 1-on-1.

No one

NONE. Too much hax, and Shield Durability.