To be a bit less abstract, if x and y are sportiness and intelligence, and they're uniform, then the AND rule gives you bright, fit people (i.e. the sort you naturally like), with a few superstars, whereas the OR rule gives you uber-nerds who may or may not be sporty and uber-jocks who may or may not be bright.

In fact it also might depend on how x and y are distributed. If they're uniform then the difference between the AND and the OR rule feels less pronounced than if they're gaussian. I think that the gaussian/AND case is going to give you very few people who are good at both, whereas the uniform scores case gives you some.