Here in CA c1 and 2 are lumped together. At least anything that is paved, i.e.; not singletrack trails.
IMO get what suits you. Test ride as many as possible and then pick what you like.
We have both, and frankly, the throttle isn't really necessary unless you simply don't need/want to pedal at all.
That said, RadPower's twist throttle is pretty cool. I liked it better than I thought I would.
We finally got both of Wifey's bikes out yesterday and put a few miles on them, trading them back and forth - the Roll conversion is a conventional hub-drive with throttle, and new LIV Amiti has the Yamaha sync-drive mid-drive system. She really likes them both, for different reasons, wants to keep them both. The LIV is a little smoother, faster, and the user interface is smoother and more integrated - it goes when you pedal it, the faster and harder the more assist. The hub drive just goes when the crank turns, and then you can hold speed with the throttle.
You really need to try them both and decide which one suits you better. A mid-drive is definitely a better climber. They both have similar range and speed.