TBH I've done the grooved thing before and I think they're a bit of a gimmick. I'm just running brembo plain discs, and they're great. Haven't tracked it yet but I'm a heavy brake abuser when I'm on a quiet twisty road.
Im only after some that are drilled and grooved as my rear ones are so tbh I'd think it would look silly if they were plain although if the rears were plain it wouldnt be an issue but am not forking out for new ones on the rear too lol