W3Champions is an unofficial amazing work to bring back to warcraft 3 what reforged has taken away (mostly ladder and tournaments, for competitive games). But there's more, since they could provide intercontinental servers that offer low ping for players from different continents. We have for the first time in history pro players from china battling with the ones in europe, european vs NA, etc.
Back2Warcraft are the guys that stream and cast most of the competitive games. I suggest you watch them live on twitch when there's some tournament, and/or on youtube for past games.
It's a great time for warcraft 3, thanks to the great effort put in by fans. If only the game hadn't been killed by Blizzard :(
But there's still plenty of people playing, with classic graphics and W3Champions servers (you still need reforged), and plenty of pros to watch.