[Shimmy]

Because I've been to all 3 cities and while I spent far less time in Medellin I had much better results than the other two combined. If you do some research on previous threads you will see that Argentina and Spain are among the hardest places while Colombia is the exact opposite. This map isn't perfect or 100% accurate but for anyone not wanting to do the research or travel there to find out this will give you a good bang for your buck with 30 seconds of research:

http://www.targetmap.com/viewer.aspx?rep...map=%5B%5D