Balanced Output from Transport

Many of the so called high-end transport come with an XLR digital out put, does digital signal comes in balanced and unbalanced format? What's the diff between 75 and 110ohm in sound?
Yes, the digital signal in AES/EBU format provided on XLR jacks is electrically balanced. In my experience, a balanced transport feeding a balanced DAC will probably sound superior utilizing the balanced XLR digital connection, rather than the single-ended S/PDIF connection on RCA's, and assuming the cables under test are comparable in quality and character.