Swap Curry for LeBron on the Cavs and they are demonstrably worse. Put LeBron on the Warriors and they are different, but even devil's advocates could only argue minor dropoff or they could actually get better via defensive upgrade.
But no question Curry is the MVP last season and this season. And Curry is a better offensive player than LeBron over the past two regular seasons. Remember though Igoudola was finals MVP and LeBron was more valuable in the finals.
FINALS STATS (Curry shot 4.5% better = 1 more make per 22 shots & had more steals, otherwise LeBron)
Player: PTS, FG%, REB, ASSISTS, Steals, TO
Curry: 156, 44.3%, 31, 38, 11, 28
LeBron: 215, 39.8%, 80, 53, 8, 21