we currently have neither, our supplier has only just found out that brembo do slotted 280mm rotors!
we've run slotted before, i'll get Yoz to post a picture up that may interest/surprise you
we normally use the Brembo GrpN plain high carbon discs
drilled i wouldn't touch (i have hispec drilled rotors on mine, they're about as good as the aussies are at rugby! )
(i know, i know, english sense of humor takes some getting use to!!)