John, it really depends on how you use the trailer. Our first Airstream had a Dometic A/C with a heat strip. While it was ok, the heat strip on my unit had no thermostatic control. That meant when it got cool I needed to turn it on. When it got too warm I had to turn it off.
When I changed trailers and went to the Classic I ordered the 15K heat pump unit. No issues regarding off and on since it has thermostatic control and due to higher BTU output, it minimizes the use of the furnace till the temps get below 40. So that save propane. The bad side is that the unit is more expensive than a unit with a heat strip. Dependent upon its use, one might consider that it may wear out sooner in its lifetime since it will be running more. I make than assumption based on the folks who live around me who own heat pump units. Typically they replace the heat pump sooner than those who have air conditioning units only. On the other hand a home heat pump's annual run time is probably much more than what an RV would rack up......unless you are full timing.
If I had to do it again at this point and based on my travel locales and travel timeframes, I'd still pick a unit with a heat pump. For others a heat strip unit might be perfectly acceptable.
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700