i have both currently, compared carefully, i feel they work equally well (which is very well indeed) - leaves the music sound calmer, blacker backgrounds, cleaner tighter deeper bass, all that good stuff, so to speak
specifically, i use the optical sfp slot out of my etherregen a-side into an optical rendu with lps feeding both... that may be net net a lower noise solution than using a lowest common denominator fiber modules and switching power supplies