What's your goal with wanting to buy a property? Are you buying to live or as a rental property; are you looking for capital gains or rental yield; are you comfortable hiring a property manager in the country where you buy...?
The USA is a whole lot of wildly different markets; San Francisco and Stockton, for example, are less than two hours apart but they're completely different. Japan is its own weirdness (IIRC property prices in Japan have been on a one-way slide lower since 1989, though I haven't checked in the last couple years), and god knows about Switzerland. You should figure out what your goal is first, then figure out where you want to buy.