Original software DOOM is
pretty crazy.
Another "in-between" option is PrBOOM+ (PrBOOM Plus). It is pretty good, though it's useful for things "in-between" Chocolate DOOM and a fully reworked modern (g)zDOOM type engine.
I've been playing the DOOM III BFG edition (
LE GASPE!) and it's not bad really. (Digital Foundry didn't realize why the original two games run at 35fps.) It's not a high-effort port; the little "whiz" effect in "Suspense" sounds indescribably terrible, possibly a screwup with the included MIDI instruments. You can't strafe+strafe run (SR50) because you can't map a strafe key, and in fact all three games share one configuration (which is a pain if you don't realize you have to go into DOOM III to configure movement). Some other things are just normal - I noticed a lot of slime trails and wallrunning this time, and the 35fps feels "familiar" and makes the low framerate animations more bearable. Some things I just didn't remember - having to trigger the exit switch to find out the secrets count is kind of foreign to me these days, and while mousewheel weapon selection is convenient, having the super shotgun at the end of the weapon rotation is pretty unwieldy.
If you want a laugh, play the first episode on "I'm Too Young To Die!"
It smells like rotten meat, but it's just touch typing. It must have been aimed at people who would play DOOM like this:
Okay, where's the "Control" key...
That didn't do anything...
Hey, there's a monster.
Why can't I do anything? My guy doesn't look good.
Luckily for them, "Hangar" has no enemies that can reach you from the starting position on ITYTD, and in fact only has two riflemen and two imps! The first seven maps are poor training for dealing with the Twin Barons, though.
After the first episode it's striking how many screwups there are in levels. There are two maps in the fourth episode with bugged secrets, and at least a couple places with glued-together enemies. I did have fun relying on monster infighting to clear out the tough E4M1. DOOM's third episode would have been a rather disappointing ending to the game, though I liked the "play E3M1 backwards" trick a bit (though here it makes the episode seem even more threadbare). I've gotten more appreciation for the DOOM II maps - starts out with fun stuff (like Tricks and Traps - this time I went ahead and opened everything up right at the start, and let the Barons demolish everything) and then finally gets in gear around the halfway point (at about The Factory).
While I still used the regular shotgun way too much in DOOM, I've gotten more appreciation for the BFG (clears out that first room of Imps in The Factory nice), the Spawning Vats, for punching pinkies / spectres, and for people who are crazy enough to punch out cacodemons and barons (and similar things), where the shitty moving hitboxes foul me up repeatedly.
DOOM III is also moving at a nice pace, though Steam overlay + screenshots bug achievements; restart + reload your save if you have to open the overlay or take a screen. I think DOOM III is a lot more fun now that I've learned now to hoard the plasma ammo. The much-complained-about textures seem...well, they do seem low rez but I've not found any decisive source on that. The FOV and 16:9 support, and the increased brightness, actually look fine on my monitor, with FOV issues only rarely appearing in cutscenes.
tl;dr: DOOM III BFG on PC is the definitive version, a few quirks aside. DOOM II and DOOM III both have new episodes. Some of the Xbox 360 DOOM levels are missing I guess, but other than that (and Final DOOM, a sad exclusion) this is pretty much it. You may wanna play them DOOM levels in a source port though.