Which GMAIL notifier for Ubuntu 9.04 is the best?

"gm-notify - A simple and lightweight highly Ubuntu 9.04 integrated GMail Notifier which takes advantages of the new and nice notify-osd and indicator-applet.

Setup and configuration gm-notify"

"If you're only considering to check webmail like Gmail and you've got Firefox running anyway, then an alternative is to give the popular Firefox add-on Webmail Notifier a try.
It features multiple account checking, and also settings for displaying unread mail counts. An icon will appear in the bottom right corner of Firefox's statusbar. Left/right clicking gives you options like unread count, and opening your Gmail inbox in a tab."