I have used 3 different brakes.
The Itaka system on Sodikarts–very good.
Arrow on my BMax–also very good
OTK on my Tonykart–not as good as the other two, but I drove a friend’s Tonykart and his were much better, so I have to assume his brake cable set-up/ the newness of his pads / bleeding made the difference, so I’m trying a few things.
I hear than Ven 05 are the best OEM brakes, but that Kelgate makes a terrific aftermarket system.