SpiderOak vs. Dropbox

I'm testing SpiderOak and Dropbox as possible ways to keep my documents in sync between home and when away with my laptop. Anyone have any thoughts on which might be the better choice? Right now, I'm leaning towards SpiderOak, since it includes a built in utility for choosing which folders are synchronized with different computers and twice as much space as its similarly priced competitor. On the other hand, actually using the service is more helpful than comparing the basic gist.

Incidentally, if anyone wants to join either service, below are links to get a referral. The referral links with give you additional space in your account (and, as a bonus, in mine, too!).

• SpiderOak

• Dropbox