If cheaper without the remote, I'd forgo it. Turn on and set t-stat and you should be good to go. Remotes just get lost and are rarely needed except for the tv. I have remotes for the radio, fireplace, tvs, sat receiver, and a couple that I have forgotten what they're for.
Always use an electric and think the ceramics seem to be the best but you have to watch the power draw on a circuit and over all for the unit as you're probably limited to just 30amp service. You might want to rig up a second power input using the 20A plug on the CG post and using it to power a dedicated outlet installed inside your RV. That will leave the 30A service to power up the microwave, etc without blowing a breaker. Also allows you to run a 2nd electric heater if necessary. Also remember that only the onboard furnace provides heat to the holding tank area. Electric heat stays in the living space but if you are in below freezing temps for more than 24 hours you need to consider cycling the furnace stetting the tstate at a lower temp at nite and using the electric to kick it up if the furnace can't keep up.
Where I camp, CG power in included in the site fee so why burn your own propane when you can heat with the electricity you've already paid for?