I've heard that alloy nipples occasionally break.
Haven't ever seen a brass nipple break.
If you're posting to Bike Forums C&V, I highly doubt the extremely small weight advantage will make a difference in your riding.
Take the brass, leave the alloy.
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If someone tells you that you have enough bicycles and you don't need any more, stop talking to them. You don't need that kind of negativity in your life.