I'd put the Edelux on the audax bike as they're pretty reliable and something I can trust during an all-night audax ride.
As for the SP and SON28, the latter is definitely reliable, the SP is too early to tell, but first impression is positive, think it's safe to go for the SP.
Budget - Cyo
Ulimate - Edelux II.
Both those light are very bright and don't dazzle thus allowing you to point the beam much higher to see further.