I say Sektor. He isnt as difficult to use and can zone a lot more effectively. His homing missile can create easy openings and his juggles/relaunching abilities are more viable imo.
unless your w1nter warz, cyrax aint happening against the higher mid/high tiers. To use him right, you gotta think far ahead of your opponent to keep them trapped in bombs, nets and airthrows. I think he's real fun though