What is the main difference between those two? from my testing they seem to do the same thing (calculate a direction?)
also what exactly does Tolerance do in the Normalize node?
GetUnitDirectonVector gives you a 1 unit length vector right off the bat. NormalizeVector takes a vector which is not 1 unit in length and makes it 1 unit long. So totally different thing 
If you try and normalize a very small vector, the node may return zero if it thinks the length is too small to safely normalize. I think the tolerance is to do with that, but you usually don’t need to worry about it.
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Hey ClockworkOcean, thank you for the answer. Do you have an example where I could use each?
