Before we delve into this you should first keep in mind the Top 10 countries that people generally migrate to. The main centres of immigration in the world are the Middle East, Singapore, Switzerland and Australia. However, more specifically for pharmacists looking to migrate, statistics collected via this website show:
A correlation between the list of countries that have the highest pharmacist wage and where people want to migrate to. Essentially, Australia > Canada > the United States > the United Kingdom. The reason for the difference between the two lists is most probably due to the difficulties in obtaining VISA in the areas with the highest wages. i.e. the US and Switzerland are commonly cited as being difficult countries to obtain VISAs from. Conversely, Australia and Canada are seen as somewhat easier to obtain VISAs.
In regards to this website, the most popular articles which illustrate the most popular migration routes are mainly to do with pharmacists moving from India towards the Middle East.