There may not be too many folks who have ridden both bikes at this point. Those who have ridden either bike will chime in about how great either one is.
I have the El Rey and can say its a GREAT bike. I am sure the Sultan is too (its a Turner). Having previously owned a Turner, I would have undoubtedly bought the Sultan if it was available earlier. Since I could get the Ventana 2 months earlier, and I wanted something now, I gave the El Rey a try. Going with the Ventana was a good call.
Random thoughts:
-The rear suspension is the most laterally rigid I have ever ridden. The suspension movement is incredibly smooth through the entire length of its travel. Might I say the best I have ever owned? The frame is burly.
-Geometry is balanced and spot on. Feels great going up or down.
-Fit 'n finish seems a little better on the Ventana than on my Turner. Both are great, but the Ventana is little better.
-The El Rey doesn't have bushings. I love those darn Turner bushings, but I live in San Diego which never really push them to their capabilities.
Intangibles:
-Turner bushings
-Turner offers an annodized finish, Ventana doesn't. Ventana's powder coat colors are cooler.
-Able to go full custom on the Ventana. All fabrication done under Ventanas roof.
-5" travel kit available for the El Rey allows for future "growth".
-Other than the above, their both good, take your pick.