I'm on two of the three. May give Deep Tracks and the Loft a chance. I actually like The Bridge and 70s station, along with Margaritaville too. Even trying No Shoes Radio.
The Loft is by far my favorite and the most eclectic; it's basically free-form and dependent solely on the whims of the DJs, who are among the best in the business imo. Deep Tracks plays a lot more of the classic album rock that I love than either Classic Rewind or Classic Vinyl, both of which tend to focus more on the hits.
I basically follow Meg Griffin around the dial. She does the morning show on Deep Tracks and the afternoon show on the Loft. She also does occasional spots on Classic Rewind, Classic Vinyl and even the Springsteen and Petty channels.
Speaking of which, the Petty channel and Little Steven's Underground Garage are both excellent, and both among my six presets on my first screen.
Pleasant surprise for me has been Outlaw Country, which plays more Americana/Alt Country than anything else.