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All together racing or not, the blanks will do better than the X-drilled. Some circuts have slotted rotors, which has been argued weather or not it actually makes a difference or not. When it comes down to it, its the mass of the rotor that makes all of the difference. If you get a thick blank one, that should be the best. Besided, having them X-drilled and slotted generally lead to cracking.

I have X-drilled and slotted just because they are big in mass, and I love the way they look. My old ones started cracking, I just got some new ones, and had them cryogenically treated. That should help them from cracking, and should also help with the longavity of them.