No one knew those you listed would not be good bets before they weren't. 

However, the rising popularity of mid-term rentals, lasting 3-12 months, is also noteworthy.

While BP has a rent estimator as does rentometer.com (both allow a few free uses, I believe), I agree with @Zachary Deal that your best bet is to seek out guidance from either the listing agent or a property manager well-versed with the area. 

Philly is your best bet. 

Hi Saju,Well it is an exciting market with lots of future developments happening, all aligned with the popular Dubai 2040 vision.As for how the market is for US investors, there is no local tax on capital gains, or tax on rental income.

Buy quality assets with NON section 8 tenants that have 700 fico scores thats safe bet in the US>  And what I do ..

Contrary to popular belief, this is not set because I believe it will give me a higher return.

Hey @Isadore Nelson - I'd bet my life savings on the fact that there's multiple reasons why other investors haven't scooped this up yet. 

So Real estate is the best bet? 

Don't bet on passive appreciation, just forced appreciation.