there have been several recent threads on this subject. respectfully suggest you search for them.
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I will give you my 2 cents worth of advice. I own Wadia 8 transport and 15 processor and also have the 4 inputs. I have found through extensive comparative listening and also with the help of my local audiophile club, that the glass optical (ST type or AT&T) is the smoothest most analog connection. It is followed closely by single ended 75 Ohm BNC to BNC SPDIF connection. Further away is the 110 Ohm XLR AES-EBU and the last by far is the plastic optical (Toslink) that has internal reflections that induce a kind of jitter.