Working on the road and stuck in hotels through the week, I listen to/watch them all. Patriot pretty much every day, Church, Beck, Wilkow, Hannity, Levin, Webb, Cam. Still watch Fox news but not as much as I used to. Catch Rush on occasion. Bauer and Rose are good on Sundays and are a little more religious than some of the others.
Here's my take: all of them will have their faithful listeners, but the programming is designed to grab a diverse audience depending on the delivery and the audience member's political "age". When I first got into politics, I was PISSED, and Savage was the man! Now, not so much. Levin and Wilkow are too angry for me, Hannity wines a bit too much and I don't like the "fair and balanced" anymore. I know exactly what Juan Williams is going to say. I'll find Williams' show if I want to hear him.
I like Beck for the levity, and for History, it's hard to beat Mike Church, although he irritates me sometimes.
I do believe it's a very similar message, the difference in delivery is what keeps your ear.