I'd rather watch a high quality USHL team then an AHL team. At least with the USHL team you would get a "team" to follow. For the most part the team would stay the same throughout the year and these young men/kids could build a relationship with the communtiy. The AHL typically turns over the majority of their roster throughout the year and there best players are only around for part of the season, before getting sent up to the NHL.
While the USHL is a "developmental" league the goal is to win a championship. In the AHL the goal is to strickly develop players and get them to the NHL. In a lot of cases you'll see a player who is actually better than another one, but will not get the playing time because the NHL team doesn't have the $$$ invested in him.
Just my opinion.