SLC a bit brighter, pin cushion distortion
SV EL better edges, flat image, possible rolling ball when panning
Ergonomics vary according to user

I compared the SLC, SV EL and HT last fall extensively. Not a bad bino in the bunch IMHO. I am not bothered by rolling ball so it was a non factor. Preferred the ergonomics of the SV EL over the SLC and HT. Swarovski seems to have a better customer service reputation than Zeiss.