What everyone forgets is that drilled or slotted rotors actually reduce performance. Yep, I said it.
Why?
Because those slots or holes result in reduced surface area for your brake pad to contact. You WANT the most surface to surface contact. By adding those grooves, you're likely reducing 10-15% of contact area.
Cars like the M3/M4, or C63, or whatever performance car that comes with slots or holes from the factory are oversized to compensate for that lost surface area. Look at how huge their rotors are. Bigger rotors make up for otherwise lost area.
Beyond that, as everyone already pointed out, different rotors will never result in better braking, unless your existing ones were shot. Why would they? It's a metal surface vs another metal surface. Those grooves or holes will only help when your brakes are reaching high temps from extremely hard driving, and will result in less brake fade... But for city driving, you'll NEVER experience those kind of temps. So you're not gaining anything. You're actually losing surface area. That's it.
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