Do this
>>1067906 if you are gonna go for the remaster. Buy it on steam or where ever else you want if you are gonna get the original. This is because the original needs to be optimized a bit before it can be considered playable on pc and that is done through mods, (dsfix and optionally dual monitor tools if you use more than one monitor, but that is not exactly a mod) which I imagine can be more of a hassle when going for the piracy route.
As for which one is better, I have only played one of them so I can't say.
I recommend getting a gamepad of some sort, but I managed to complete the game with a keyboard back then.
