I guess I am not really qualified to say what is best, but I have shot with a few and have my opinions.
- Schon's 3 of them - 5/16"-14, Really like, nice crisp hit & ballance, I have 4 Schon shafts and 3 Jacoby Schon shafts - 2 ultra and 1 carbon, all use same brass insert
- DZ one cue one shaft - 3/8"x10 modified, great hit, not as crisp as my Schons but cue feels like a one piece cue, I really like this pin for a joint, it feels so perfectly fit and snug going together.
- McDermott 3 cues 3 G core shafts, 3/8"x10, felt a little sloppy screwing on as from the factory, much better fit after super gluing the shaft threads, solid but somewhat muted hit
- Jacoby - Radial pin, great solid feel screwing together, great hit also, cue felt as a one piece, really liked this cue as much, possibly more than my DZ
As to what pin is the best, and just based on fit, it for me it would have to be the 3/8"x10 modified as the pin seems to be such a perfect match for the shaft threads. As to the hit of the cue, to my way of thinking first it would be how accurate the joint facings were of the shaft and butt, then I guess what joint materials are facing together. I do know that I really like my Schons, my DZ is fantastic but softer hit, and the Jacoby, I really wanted to buy from my friend but my wife had to mention that I had just bought that DZ. As none of the cues used the same shafts, I'm sure that had some bearing on the hit of ea, although it's hard to explain how different the DZ, and the Jacoby felt in comparison to the others. Could just be imagining it, but they felt like they were a one piece cue.