DA is mich more stable than cPanel. Switching from cPanel to DA doesnt bring you trouble. We have switched 20+ servers without any trouble On DA, you will have Installatron, the same things with Fantastico

You can try DA demo at http://www.directadmin.com:2222/ username: demo_reseller, password: demo. That's reseller level. You can try User level by clicking to User level on the right