That point about the Gauntlets of Power and the darts is interesting... I know there is a strength bonus but I didn't count with them
EDIT: and indeed, my character died before it could make proper use of the crossbow bolts, where with darts you can make use of them right away since they are plentiful. It died due to me experimenting with my character, wondering 'what happens if I try this?' tho
If I had to choose, I would go with darts. No messing around with a launcher. This could be useful since many rogues tend to "devolve" into a two-weapon fighter in the later game. Also, darts will receive a significant boost from Gauntlets of Power, as will the rest of the rogue offensive game. But crossbow? None...
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