Best Leatt knee brace?

Knee braces are too subjective to say which is best for an individual without trying them on to see how they conform to your knees and the rest of your upper and lower leg.  Even if from the same manufacturer.

Big difference is the patella cup is integrated in the C-Frame versus a separate sleeve on the X-Frame. Also, on the C-Frame, there is no inner hinge like traditional braces. It's completely exposed. I have the C-Frames and love them for this. I find I have better feel on the bike because of it.

I tried a pair of Leatt, I think it was X frame.  They were made well but didn’t feel I couldn’t keep them in place.  Sent them back.  Leatt makes good stuff. 

I’ve tried a lot of knee braces over the years and once the C-Frame came out I’ve never looked back. Not having the hinge on the inside gives me a better feel and grip to the bike.  They also have a knee brace pant which I use that keeps them in perfect place. 

C Frame 100% for me.  On my second set.  Love the ability to grip the bike when wearing them compared to other knee braces.