I prefer the lumenarcs for a few technical reasons, like the lumenarc DE being 14x14 and the lumenmax3 being only 11x11 (barely larger than a Reef Optix3!)... I mean, if you are going to go with a high-spread reflector... 11x11 isnt much.
The other reason is because SLS sucks in so many ways these days. Their customer service, their Tek2 reflectors, etc...