I use the Thunderbird email client under Fedora at work. I've been searching for a different email client to use to retrieve my personal email since I prefer to keep those messages totally separate. After doing a bit of research, it looks like Evolution and Balsa are the two top email clients (aside from Thunderbird).
I didn't find either to my liking. Evolution (at least the latest version available from Fedora's package manager) was terribly unstable. It also had the worst address book of the 3 email clients. Its rendering of HTML messages was substandard at best. It doesn't display embedded images by default and didn't always display them when I selected the display images option.
Balsa wasn't much better. It was more stable than Evolution but it really didn't support HTML messages well at all. Retrieving messages frequently caused the sorting of message in the Inbox to get confused, forcing me to select the Date heading to force a re-sort. The filtering feature was very disappointing. Adding filters made it activate procmail filtering which caused messages to get stuck in the command line mail utility.
I've settled for using Thunderbird for both work and personal email. Using one of the others just wasn't feasible.