I think it depends on what your favors are. If it's someting edible then one per gues. If it's a bigger object kind of favor than I would do one per couple. Our favor are mini lanterns that hold a candle. We put a battery operated candle in it & we're doing one per couple
We're having heart-shaped birdseed feeders and we're doing one per person. We almost did one per couple but we have A LOT of kids and teens attending the wedding and didn't think it was fair to just do one per couple/family.
Re: How many favors?
With All the Trimmings
It does depend on your favour though.