I've heard some different things about this. I've heard that this is an official wanikoko release, and I've also heard that rev15 is going to be released by wanikoko on christmas eve. I'm just throwing this information out for you to think over (and also for anyone to clarify if the have any reputabule sources.) I have rev14 installed and can play every game out there. It's linked in my sig.
Since you seem unsure: For future reference... .dol files are installed by creating a new folder called whatever you want in the apps folder on your sd card, putting the files in that new folder, and renaming the .dol file to boot.dol after that go to homebrew and install it that way.
For wad installation, put the file in the wads folder on your sd card, go to wadmanager in homebrew, then install it.
I would personally recommend sticking with rev14 as of now. It works with the newest games. If it's not broke don't fix it.