Level 22
Content Creator
I greatly prefer Patch My PC, because it can download and silently install program updates. On the other hand, SUMo doesn't handle the updates itself, it just provides a link to the software's download page.

Aside from how they handle updates, a big difference between the two programs, is that SUMo can find updates for many more programs that Patch My PC does. There is reason for this. It's easy to provide a download link for software, but takes a bit of work to be able to actually download and silently install the updates. As a result, all software updaters that handle the updates themselves, have a fairly limited range of software they can update.