I think he "prefers" it too. I'm just saying I'll never be as good at getting him off because I can't beat his own hand. But it was blantanly obvious he loves it.
Personally, with my gf/exgf/whatever she is...I got off wayy faster from a handjob than anything else. Probably because she was an oral/sex virgin at the beginning. She definitely knew how to use her hands though...
I prefer(ed) oral sex though because it was a slower build up for me. Probably different from guy to guy/girl to girl. Whatever the guy prefers and whatever the girl is best at...