It's a miles better sport to play and watch once you get used to it, and that's coming from someone that has played both. The speed of the game is so much different and much more action friendly in league.
I'm guessing your question before was due to that being the position your son is playing in? I'd say the main difference between props and second rows, is that second rows are usually fitter and not quite as big. They also see more sides of the game attacking in wide areas, whilst also expected to do the dogs work down the middle. Class position to play in only beat by loose forward for me.