I haven't used CentOS for very long and when I did it was long ago, so this comment isn't the best-informed. But from my brief experience, you have access to mo

I haven't used CentOS for very long and when I did it was long ago, so this comment isn't the best-informed. But from my brief experience, you have access to more or less the same software (plus or minus some version numbers), but with their configuration done totally differently from Debian. I.e., config files are in places you're not used to, and sometimes sourced in different ways. Some software runs differently too; for example in Debian Apache runs as www-data, while in CentOS it runs as apache. It's not a bad thing, but if you already know Debian, I don't think there's a huge reason to switch to CentOS.