I have offers from both and am deciding presently. I don't know that they're "aggressively" recruiting me though.

The reason I'd rather work for them than start my own company (now) is that I'm interested in infrastructure. I could go start a company and be an architecture astronaut (and never sell any infrastructure to anyone), or I could go to Google/Facebook and learn the kind of domain specific knowledge that I can only get at a Google or Facebook.