I always hear people either favoring Melee, Ultimate, or Project M/+ (which is a modded version of Brawl)...but content and presentation wise, Brawl is probably the highest along with Ultimate in praise as this game was absolutely packed with jams, the nostalgia of many people growing with it and the Wii, and of course, the first third party characters (Sonic and Solid Snake; the latter which didn't even show up in the Wii U/3DS game)