Here are users' opinions of the
HP.
Here are users' opinions of the
Canon.
Looks to me as though people are a little more satisfied with the Canon.
IMO, I think I would go with either one - there seems to be less and less difference between all in one printers these days - and it comes to who has the better price, availability, and ink prices (which I would buy online to save money).
As an Amazon Associate, MacRumors earns a commission from qualifying purchases made through links in this post.