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I've joined friends in having drilled discs on previous cars and they've always suffered from cracking. Cracks form between the holes, until you end up with a dangerous web, looking like a molecular structure... cue premature replacement.

The idea of holes and grooves are much the same - the pad and disc are kept apart by a bed of gases. Grooves and holes both allow these gases to escape more quickly, resulting in more efficient braking.
Holes do a better job of cooling the disc, but as said, can crack up. Grooves are initially excellent at reducing gases but they can block up with compacted dust.

Neither are much of a thing from the manufacturer. You can buy a car that costs more than a house, with huge brake discs, but they're plain. There's something to be said about that.
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