Getting paid in BTC or converting your fiat paycheck to BTC - what is the difference?

I believe there should be some sort of difference (tax-wise or otherwise), but somehow I am unable to find it.

If someone is willing to elaborate: what are the pros and cons of signing a contract so your boss is paying you directly in BTC and what are the pros and cons of converting your whole paycheck yourself on an exchange? I know it maybe a state- or country dependant, but you can just answer to the best of your knowledge in your particular case.

In both cases we are assuming that you are getting your complete salary to a BTC cold storage for the long hodling and you won't need to convert anything to fiat in order to pay bills/anything else anytime soon.