Any significant differences on these Delta Connections?

I usually fly UA or AA, but I'm going to be visiting my parents in ORF, so Delta it is. I'm wondering if there's anything I should be aware of, or be looking for, with these Delta Connection options, flying in coach:

• Pinnacle, on a CRJ
• Shuttle America, on an E170
• Gojet Airlines, on a CR7
• Chautauqua, on an E135/140/145

I'll be flying with my wife, so the one seat side on the smaller Embraer isn't really a feature.

Anything here significantly better/worse than the others, or should I just book whatever the most convenient times are?