* Location
* Work Authorization (and/or Visa issues)
* Average weather throughout the year - Max temp - Min temp
* Exchange rate
* Avg. Internet Speed + Prices
* Language barriers (or lack of).
Something similar to this [1] but with a crowdsourced/community aspect with solid sources.
[1] - http://fundersandfounders.com/where-to-start-your-startup-be...