Welcome to City!
I'll make the controller/dominator debate simple... If you want to team more than solo, I'd go controller. If you want to solo more than team, I'd go dominator.
That's not to say that a controller can't solo or a dominator can't team, but just that that's the way the ATs were designed.
For primary, Illusion is my personal favorite control set. On controllers, it blooms a little later (23-26ish). On dominators, you get Spectral Terror early, which really helps.
Mind is a late(er) bloomer for both ATs, it's not until you get terrify slotted that it really comes into its own control-wise.
As for secondary, my suggestion is simply "pick what sounds fun/fits your character's theme"