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Slotted is used in racing applications to improve cooling. Slotted replaced drilled there a long time ago; Google the history of drilling rotors and their original purpose, and you'll understand why drilled is obsolete today.
That said, slotted for street isn't rational IMO; you can use them but they're not as quiet, eat pads faster and are more expensive. OEM blanks are dependable, work well in all applications and are economical. Frequent track goers including myself use blanks for all of those reasons, and the fact that they last a long time. Unless you're concerned with appearance, in which case our brakes look crappy anyway, blanks are the practical route.
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2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue, 6MT
Past: 2021 Z4 M40i Frozen Grey II/Black Alcantara | 2017 F30 340i Mineral Gray/Coral Red, 6MT | 2011 E92 335i Le Mans Blue/Black, 6MT
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