Peter Svensson, a Technology Writer for the the Associated Press, recently compared LastPass directly against RoboForm with ease of use being one of the most important considerations.
Review: LastPass and Roboform take password management to the next level with online storage
Peter wisely discusses why the way most people store passwords is extremely insecure and espouses the benefits of password management applications. He covers how the new breed of password management applications are storing passwords encrypted online to allow universal access to your data.
From the article:
The [RoboForm] system is still cumbersome.
In providing an online storage option, Roboform is catching up to a new password management program, LastPass, that's designed from the ground up to store passwords online. Trying that, I found it slightly easier to use — at least, it didn't confront me with cryptic dialog boxes. It also has the virtue of being free, while Roboform costs $30.
Since LastPass is free and has the edge on browser and Mac compatibility, it should probably be your first pick.