Never kill either is my vote. We desperately need bees and wasps. I'm scared to death about what would happen if they all died off. And many wasps actually do contribute to pollination, from what I've read.
Yeah pollination... smolination they little bastards are annoying as fuck.
Here's my thing, I'll never kill a bee! And when a wasp comes into my house I'll always try and usher it back out first. However I did have one Wasp that tormented me at a BBQ, kept coming up to me and scaring me and landing on me. I felt something on my lower back, ran my finger back and realised I was CLUTCHING it between my two fingers! In a panic (it was trying to sting my finger for grabbing it) I threw it to the ground and STOMP.
I'm usually a forgiving person, but if something is out to get me THAT much. I kill it.