It's worth having all the IWADs though, just because they're worth playing through at least once, and there are great mapsets out there for each one of them. It's also got a much wider set of monsters than Doom, as well as the SSG.so most level designers generally target their WADs for Doom 2.

That's pretty much because most level sets are made for it, as it's kinda the de-facto blueprint for a 32 map megawad.

I have come from the Doom community to help you!If you want to play most of the wads that are out there, you're gonna want Doom II. I have no idea what the difference is between Final Doom and The Ultimate Doom.Bear in mind that I do also want a version that is compatible with custom WADs and mods, such as Brutal Doom.

For those that know about this stuff, what is the currently best version of Doom I can purchase? Steam has a whole bunch of options, as does GoG. The upcoming release of Doom 4 (D44m, Doom4?) made me realise that I haven't ever seriously touched the original, even though I feel it is a game I would enjoy, if only because of how I have enjoyed titles such as Serious Sam and Shadow Warrior.