Having created airplanes for both sims, I will say that creating a new model in CRRCsim is extremely difficult and not very well supported by the community. However, creating models for Clearview is also difficult, but has better support and far more examples to learn from.

I would want my trainer airplanes to be easy to fly and provide help with learning orientation. Most real trainers are setup to fly hands off with full throttle providing climbs and less than half throttle descending.

With either sim, we can create models that are difficult to fly too. So, to get the best experience in a sim, fly several different kinds of models and practice your routines until you are comfortable in the sim. Nerves will make reality much more difficult.