I have always been a Wolverine fan. I know he is nto the most perwerful but he has an extended life and has superhuman healing factor.
Professor X if he wasn't crippled. So I'll prefer his son David Haller (Legion), but he got Mental Problem and can't control himself. JeanGrey also uncontrollable. So X-Men with mental powers can be a bad thing for me
So I'll just be Magneto which can easily manipulate the magnetic field and metal. You can do a lot with that ability since magnetic field is all around us.
I want the powers of Professor X. Then I will mind f**k everybody