You're comparing LeBron goin to the Heat to Durant going to the Warriors. Something that could only be rationalize by being either a LeBron hater, Warriors fan or just being dumb.
Before LeBron came to the Heat, they were a team that was about to get swept the the Celtics if not for Wade going ape in game 4. LeBron came to a team that was average. Beside Wade, who did he have on the heat? Bosh? Nigga was a reserve on an East all Star team. No bench, nothing. LeBron also did not lose to Miami and decide to join them thinking he had no chance to surpass them.
Now Durant is a whole different cloth of bitchassness. This guy had the defending champs down 3-1, choked and then proceed to join them. Now the Warriors, were the defending champions, had 3 all Stars, had the best record the league has ever experienced and had the 2x MVP. Now this is not a knock on the Warriors, they would of went to the finals without Durant but what he did is as far from comparable to what LeBron did.
Durant joined a winning situation, LeBron made one. It's also evident because how did Miami do without him the following year vs how they would of had he stayed?