Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
Is it a dedicated folder? If so, I would go with Ubuntu server as by default it is not load a lot of 'extra' things. There are several good guides in the guides subsection.
There is no significant benefit of one distro over another. Ubuntu Desktop has to be the most bloated distro out there, and it performs within a couple of seconds/frame of the optimized stripped-down variant. I would recommend picking one you know and going with it. I have run many, including SLES, Arch, Gentoo, Debian, CentOS, Fedora, and a "folding-optimized" Slackware version, and none of them performed any better than Ubuntu Desktop. All of my folding machines now run Ubuntu Server.