I’d say get the original, it’s still an excellent game even today. I wanted to give another chance to Reforged, 3 years later. Still a buggy mess, full of crashes, audio glitches etc…
My strong advice is to do a Google search for ‘How to play original Warcraft 3’ there are several options available, but I won’t link them on here.
Reforged effectively trashed the game, even if you click the option to play with original graphics it’s still a total mess with stupid changes to campaign missions, unit quotes censored to be more ‘family friendly’, inability to play custom campaigns and God-knows what else. There’s a whole bunch of issues with multiplayer, but I personally don’t give a damn about multiplayer.
You’ll probably be unable to view the cinematics if you play the original client on a modern PC, and you won’t get proper ultra-widescreen support without mods and a lot of tweaking, but you can still watch all the cinematics on Youtube.
Warcraft 3 is one of the best games I ever played, it was a masterpiece at the time. Never played WC3R, decided to wait to see if they did a good job and they didn’t, but not only that they did a bad job and then abandoned the game.
The best version of the game is the CD version, not the battlenet version (which even without reforged is updated with removed features etc).