Also, the pins on the 5-pin are WAY more delicate, so if random people are going to use it, go 3-pin.
Is that really a concern on non-shitty connectors?
I toured for a good number of years, dealt with my share of 3, 4, and 5 pin cable, and I've never seen an XLR connector pin damaged except when the outer shell is damaged/crushed, at which point the cable is fucked anyway, and 3 or 5 pin wasn't going to make a difference.
If it's a bar, run whatever the hell make sense for the fixtures in there. If it's a venue that might see a tour, run 5 pin and some dry cat5e lines. Keep some adapters and clamp them to an annoying large piece of steel (like the and faceplate and conduit for the connector) so they don't walk.
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