The vast majority of current homeowners in those areas expect the property prices to appreciate. That may be simply a symptom of an ownership-bias. Similarly, while opinions vary subtly amongst agents, the NAR almost always expects further price appreciation. Still, that expectation probably doesn't help very much. So, be careful when you're basing your purchase decisions on expectations alone.
In every neighborhood, a handful of factors and trends have major impact on current prices and demand, like the quality of schools, jobs, commute, views, weather, etc. While some of the factors won't be changing much (views and weather), the relative appreciation potential of a location is primarily driven by the flow of money. If more money is going into an area, schools usually do better as the tax base improves. Jobs, demographic shifts, and even available credit are key contributors to those money flows.
So, if you work with a realtor well-versed in detailed analysis, she/he can help you parse out the underlying trends to reasonably assess which one of those areas is expecting the most amount of improvement in money flows. Otherwise, you'll have to base your decision on mere opinions which are usually derived from gross simplifications like "expensive areas tend to appreciate more".