Lebron didn't start any trend...he stole or went with other trends like MJ and KG's chalk toss to the Celtics Big 3, so I don't know where exactly you got your info on him being a trend setter. You want a trend, look at KD wearing his backpack during the post game interviews. You want another trend, MJ wearing long shorts ingame which I had mentioned before.
If you want to talk about two different eras, MJ's was tougher because they easily had tougher players and legit centers unlike today where there are people like Chris Bosh who are considered a "center" where they would have been a SF at best in Jordan's playing era. The only legit center nowadays is maybe Dwight Howard and Marc Gasol. There is really no inside presence in todays game which is sad because I see way to many PG/SG type players slashing their way through interior defenses like nothing. Ray Allen, a pure shooter, are long gone for high flying dunkers and true point guards like Jason Kidd are rare to find (Chris Paul, Rajon Rondo, and Steve Nash) and are being replaced by SGs being made into PGs (see Derrick Rose and Russell Westbrook).
Analyst now would hands down agree that MJ is by far the greatest since Lebron decided to quit and jump ship to easy mode. Plus have you noticed that everyone compares the next best player to Jordan? (see Allen Iverson, Kobe Bryant, Lebron James, Dwayne Wade, Anfernee Hardaway, Grant Hill, Vince Carter, Tracy McGrady, etc) never Wilt or Magic or Bill Russell