Oh, I forgot! I used IGN's until they deleted it. I tried the collectorz demo but didn't like the interface and view. I'll take a look at the backloggery. Definitely trying to avoid sites that only cater to certain platform(s).
To me, the best part of vgcollect by far is the collection view. I want to easily see the box art and game title in a list. My two suggestions with it are 1) allow sorting by console and 2) Let me display more than 25 items per page.
My work around is to export and sort in Excel, but that loses the box art and is rather annoying.
The other thing I'd like is a number of games owned. Right now it sums the number of total items, which includes hardware, toys to life, demos, etc