In my personal opinion, during the learning stages it is very important to be relaxed and calm (as much as possible, of course),
it is during this learning curve when your airplane/s will be facing accidents and such, guess what hits first when you crash (most of the time, anyway!), having and engine that costs more than twice the price of another (while acheiving the same thing) can be cause for the "shakes" to most people, specially those that start on this hobby later in life, for the younger generation, price is more the issue. A two stroker can take a lot of hits and still be operable, four strokers are more prone to damage and are much more expensive to repair. I believe a two stroker is easier to learn the basics of model engine operation, while learning, one of the most annoying things is to have engine problems, so make sure you buy a good, well known, easy to care for engine, two stroke that is, when past the learning stages, by all means go and get a four stroker, they sound so gooooood!!