Doom64EX is supposed to emulate every N64 visual effects that used to be missing in other ports. It's a dedicated port that uses the game's rom as a base.
It's a tweaked emulator of sorts.
Yup, it's subjective. I feel vanilla doom to be more "bad-ass" myself because of the simplicity of it and the unmatched visual and sound design. I mean, even Doom 3 and Doom 2016 sound like crap compared to it. Weapons sound powerful and monsters sound mean. Even tho Old doom used stock sounds... To me badass is mean and simple with a marine that only speaks with his guns. New id's interpretation of the character is spot-on.
If you like modern stuff on Doom, be sure to ask on Doomworld forums for some suggestions and you could even participate yourself to some projects.
Have fun, you have acces to the biggest modding bank ever with this game. There's no way you'd live long enough to play everything. And the comunity gets new faces everytime a game releases. It's kinda scary thinking about it.