Mint is based off both Ubuntu and/or Debian, they have different editions, which is based on what is included in it.

It adds a few things on top sometimes. Personally I'm not overall impressed, as you can install any of this via Ubuntu and Debian anyway usually.

Later OS versions have apparently reduced their differences, so it's really a personal preference, aslong as you know what you want installed.

If your looking for other software (linux) to install, I like a site like this, if your more familiar with the Windows equivalent.
http://alternativeto.net/software/adobe-photoshop/