Depends on the wasp.
download.jpg
For example, that little guy is the primary predator of the black widow spider, and I'd much rather deal with the wasp than the spider.
Likewise, Tarantula Hawks may be yuuuuuge, but you need to work at it to piss them off enough to sting you, even if the result of doing so is the second or third most painful sting in the world (It used to be the second but I think they have discovered something between them and the bullet ant).
GettyImages-139289963.jpg
I'm still giving that one a lot of space, though.