There is one thing that could make or break the game: Will you need to have a Nintendo Switch Online subscription to access the levels posted online as well as post your levels online? That could be a deal breaker for those who don't have a subscription if you do need it.
And imagine that on purchase you are restricted to Mario Maker 1 elements. And rest of content, including slopes, extra characters, co-op building, 2.5D World setting, vertical sub-areas, waypoint based custom autoscrolling etc, is sold via expensive DLC packs thus reducing number of SMM2 exclusive levels available online. Speaking of online subscription: you also need it to play 100 Mario challenge, which includes two new modes:
1. No-Skip - self explanatory.
2. Rogue Mario - forced to skip level on each death.
And upon completing 100-Mario challenges you got golden wrenches which provides you with discount on DLC. No Freebies!