What's more to say than what Mike said? It would not be so popular if it wasn't secure. Have you heard otherwise?
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Its pretty secure the only thing I don't like is it always using the same default admin password and username, it can always be changed though but eh that's about it everything else is fine. I've always been more overly fond of proxmox though to be brutally honest.
Solus is being updated all of the time, so I'm not sure what all the slow update stuff is about. We've been running it for years and even have a VPS Reseller program for out close friends, never had an issue security wise.
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