If you're looking at open source panels, then I recommend:
(minimal but powerful)
I would advise you to check their website and go through a demo on their panel to see if it fits you.
If you are looking for a paid control panel then I would say cPanel. If you go with cPanel with LiteSpeed Web Server you will get high performance, secure, and easy-to-use web server able to handle thousands of concurrent connections with a small memory footprint.