Barbs vs. Compression fittings

So I'm in the middle of my research for my first water loop. As I understand it you have the cooling block, then either a barb or compression fitting which you use to attach to the tube. So I'm wondering which one is better? Are there advantages to one vs. the other?

Just in case it matters I plan on liquid cooling everything on the mobo for mostly looks and bragging rights. CPU, GPU, Northbridge, Southbridge, and PCI-e and Mobo voltage regulator.
 

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