The free ones, without promotions and all, Google offers more space (2GB compared to 15GB)
Google has the advantage of integrating with all your other Google services (YouTube, G+, GMail etc) hence its easy to move attachments/files)
I also run a lot of forms for a number of websites I manage, forms are not available on DB, also, editing of docs etc . . .
Dropbox is sexy!
Why do you look so awesome? God created you that way!