Hydrogen bonding preference in acids

[PhysicsCanuck]

TL;DR

Why does hydrogen bond more readily/commonly to one end/atom and not the other? (and which is more common?)

I can't figure out why hydrogen is more likely to bond to either the nitrogen or to the sulphur atom.
I can't locate any information in any textbooks or online as to which molecule is more prevalent/common.

This is not a homework question.
I just came across one of these molecules and wondered why the hydrogen was on one end and not the other.Thank you for your help here!

 

[DrClaude]

The hydrogen can bond to either side, but mostly to N:
https://en.wikipedia.org/wiki/Thiocyanic_acid

 

[PhysicsCanuck]

The hydrogen can bond to either side, but mostly to N:
https://en.wikipedia.org/wiki/Thiocyanic_acid

Thank you very much, DrClaude.
Could you tell me why hydrogen more readily/commonly bonds to the nitrogen?

Thank you very much for your time and help here