Yes, all 4WD Wranglers can be flat towed. Transmission in gear or park, transfer case in neutral. I don't know about 2WD Wranglers, there are a few late models out there.
Having done both flat towing and using a car dolly, I prefer the dolly with electric brakes. Much easier to hook up, more stable, and I can back up a few feet if needed. I'll never go back to a tow bar.