+1 those are inherently different cables. How that effects sound will depend on what you are connecting the Lumin to. If for example their S/PDIF isn't well implemented, relative to AES/EBU, then there will be a difference. Not being a Lumin owner, I can't comment
SPDIF vs. AES/EBU Sound Quality?
All else being equal (same cable, etc.), will the AES/EBU connection provide better sound quality than SPDIF? I just realized by Lumin U1 mini has AES/EBU output and one of my DACs (my favorite) has AES/EBU input.
A forum search and even a google search pulled up nothing definitive and I figured I'd ask before buying an $$$ AES/EBU cable