I've always said that the Championship is a better level the SPL, having watched a lot of games of both, this probably proves it.
There's no doubt that the top half of the SPL, your Celtics, Rangers and Hearts (maybe Hibs) would do alright in the Championship (certainly they'd make a better fist of it than we are currently doing), but the bottom half is League 1 at best. Tony Andreau, who was smashing it at Hamilton, moved to Norwich with Alex Neil, couldn't get close to what he was achieving there.
But then you get players like Andy Robertson and John McGinn.
What I do like about the SPL is the path to the first team made for youngsters. They have youth coaching there down to a tee.