1. Security "and stuff" is a matter of keeping your system up to date. Install the system of choice, and then immediately search for and install any security related updates that are available.
2. I'd say they're about the same. You're going to have a learning curve regardless of which distro you choose.
You have to understand that choosing a distro is pretty much a matter of personal choice. There is no "better".
One thing to keep in mind, when it comes to a server new bleeding edge is not the priority. You're after stability more than anything. A server should be as stable as a rock.
I'd suggest you google their sites, read up on what apps and features they're including, and base your decision on those facts and not on the opinions of people who you have no idea what their qualifications might be.
But that's just my opinion.