usually, but not always (in audio it is always like this!!!!!)
AES should be better
i have tested on different Dac's both plastic optical (glass-fiber Lifatec cable) and AES and i like AES more
Wadia connection ranking is:
1) glass optical (Wadia proprietary)
2) AES/EBU (now AES3) using XLR connector
3) Coax using BNC connector
4) Coax using RCA connector
5) Toslink plastic optical
unless you have a real first-class BNC output, AES is easier, it is the pro audio standard , plenty of very good and inexpensive cables around