I'm hoping we can use this thread to discuss our experiences with the game so that when we decide to start the league we will already have the settings agreed upon.
After playing a few games on Pro and some on All-Star, I am leaning towards using Pro. The difference in fielding and pitching seems negilgible, but in hitting it seems to be pretty great. All-Star seems to make hitting much harder. I'm worried that as most of us are going to be casual players, this will take a lot of the fun out of the game. Now, I like to pitch, I like duels and low scoring games. But I don't like frustration, so I'd eschew the low scoring affairs in favor of a more fun game experience. My only opponent thus far the Certis seems to agree. I will be playing on both settings some more, but this is how I feel thus far.
So you all know, in a non-official game you can change difficulty mid-game, so you can compare back and forth.