Which leads to more money made: limitware or freemium?

Limitware: get all features for a limited time or limited number of uses (ex. Textmate free for 28 days, 2GB free on Dropbox)

Freemium: get some features free forever, and upgrade to get more features (ex. Evernote, Hulu Plus)

There are even services like Basecamp which are both limitware and freemium (one project free, limited features).

I'm sure the answer is "it depends", but I'd like to here what has worked best for you guys.