Just wondering what the difference would be between these two colleges for a European Law LLM, in the areas of job prospects but also student life and course content?

Is it worth paying the ~14000 for Bruges when Leiden is only 1600 for a similar course?

Leiden has a good reputation... but nothing beats the networking from the College!
Plus, the LLM at the College of Europe is a highly specialized course... that would correspond to the Advanced LLM in European law at Leiden, which is kind of the same tuition price (about 14.000-16.000 + housing) !
Also from what I hear, the LLM at the College of Europe is mainly aimed at Competition Law. That might be one difference.
If you want a good overall degree in European law from a reasonable price, then check out the LLM's in Belgium !
All the best !