if you look for security and stability, just go with DA
Rails in DA - Ruby on Rails plugin for Directdmin | DA-Tomcat - Tomcat Manager plugin for Directdmin DA-PgSQL - PostgreSQL plugin for Directdmin | IP Deny Manager - IP Deny Manager plugin for Directdmin DeeperAdmin - Manager your DirectAdmin server "deeper"
Order now at http://www.daplugin.com
I used Plesk some time ago, years back. I don't quite like Plesk due to much limitation -- not able to expand the features with 3rd party software.
Later, I started using cPanel. Back then I have to admit that cPanel was really buggy. However, the interface and user-friendly panel was more appealing to me than Plesk, that is the reason why I tried it. Although until now cPanel is still buggy, but I'm glad that their customer service has improved. There are plenty of 3rd party software that you can install on cPanel/WHM, and our clients just love cPanel.
I do not have any experience in using Directadmin. However, I have a few industry friends who use them on their production server, the reason why DA is more appealing to them is due to the lower cost: cPanel external licence for our local server is not affordable. However, according to them, DA is quite stable. With installtron, I believe it is worth the price and should be persuasive to clients.
My votes go to cPanel and DA. Unfortunately, I did not have any sweet memory with Plesk.
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