I would have to say the Rhino Must. I only recommend this as the weight balance of it is substantially better, more forward, that their standard carbon shaft, and i have both. I did not like Rhino's tips though and, but replaced the tip on my Must to a very soft one, Ultraskin black pro, but after watching Dr Daves video, it explained an issue with some very soft tips on carbon shafts that I was experiencing in where at time you would get the object ball go off from what you expected. I immediately changed the tip to an ultraskin Red Med and have not got any noticeable object ball variations since. It is a very quiet shaft, with the tip I have now, and i would say deflection and aiming basically the same as my Jacoby Ultra shafts with the same 12.5 mm dia.
I did not have the best result with a Jacoby v3 carbon shaft I had. It was smooth and quiet shooting, but I was never consistent with it. One time it would be the greatest thing since sliced bread, the next time i would play with it I would have trouble making some shots that I felt i should have made. They now are on version 6, which I would assume would be better, but when you figure that the Must is a great shaft at half the price, one has to wonder. Then Dr Dave tested the standard Rhino against a Predator and the deflection was similar, and the new Must shaft is supposed to be less deflection yet, To me it's a no brainer, but consider changing their tip out, some like the tip they come with though.
I know one thing, I'm not buying anymore carbon shafts, but for the time being I'm also not shooting the Must shaft in league as I picked up another Jacoby a few months back with a Kielwood shaft and that is what i am shooting now. i did turn it down from 12.75 mm to 12.5 mm and also added about .3 oz just in front of where the butt threads stop in the shaft to more balance it out to my liking. It is a little harsher hitting shaft than my Must, but it still shoots great. I still shoot the Must in practice, and am shooting really good with it. It will probably be what I use next year for league, but there is two weeks left this year so i don't want to change this late in league.