It's not easy to answer. Some soft tips will grip really well with slow speed shots but lose effectiveness with harder shots because when they compress beyond a certain point the grain of the leather squeezes shut which starts reducing effective surface area.
All tips are gong to glaze a little. I have the best luck with Kamui black tips and Kamui chalk...with the Kamui Gator Grip tool.
The trick is that if you use something like the Gator Grip, or another very light scuffing tool that just breaks the glaze and lifts the leather fibers, you can chalk the tip without coating it and without sanding down the tip. That increases grip and cuts down on glazing. You see people rubbing their chalk against the tip for 10 seconds, or sometimes just furiously chalking with a squeak squeak squeak the whole time they're thinking about their next move. That is very bad for your tip, it sands it down, and puts far too thick a layer of chalk on it. Chalk should sit in the grain of the leather, not form a thick layer completely covering it, because with a thick layer the chalk particles in contact with the CB are not in direct contact with the leather tip so energy and friction transfer is lessened.
The tip will grip best with a thin but even layer of chalk, do not rub your chalk onto the tip, instead lightly roll your tip in the chalk and lightly pat it on any spots that are missed. With Kamui chalk, even though they say you only have to chalk every other rack, I chalk about ever 4-5 shots because I purposely put the bare minimum amount of chalk on. It helps stop glazing and give the most consistent results.
Different leathers will grip differently with different amount so maintenance but if you're going for consistency, a high-quality tip with good chalking habits is what I'd recommend.
