PC.
I'm forced to pirate almost all my games though since PC has been digital only for a while. I have never used Steam or any "service" like it and have never paid for a digitally distributed game and never will. It is a shame that my preferred platform is the one that started or popularized most of the cancers plaguing gaming today such as paid digital distribution and all the negatives that come with it such as easy distribution of DLC and micro transactions which encourages them, digital only, games being intentionally released unfinished since they can be patched through some platform, etc.