I have played several of the free Tournaments and was surprised that I could take as long as I wanted to make my shot. It doesn't make sense that even in Blitz you only have a maximum of 90 seconds to make your shot but in Tournament play you could sit there with a calculator and do all kinds figuring to line your shot up.
AND that you can save your game and go in and out of it as much as you want.
OR that at least in the free ones that I played in, I was by myself. A lot less pressure when you aren't playing against someone.
Granted that a player still has to perform pretty well but in my opinion a Tournament should have to be even more demanding than any kind of regular play but I think that everyone would agree that it many respects it is easier.