Warhead beat Nightmare because it smashed the wheel and motors in, not because of disc on disc confrontation. Nightmare vs. SoW was pretty much in fault due to the poor timing of the floor flippers, which pretty much ended Nightmares chance and disallowed anyone the possibility to see the outcome (Nightmares plan was to hit SoWs cage at an angle, thus pulling it in and flipping it up). Pussycat I would discount as a vertical spinner since it really is a saw, and had much less mass (and therefore force) than Fluffys bar. X-Terminator had pretty much the same sort of problem, but it had a pretty poor cage for the vertical spinner and was easily knocked out of place. Typhoon also had a much higher top speed as well as a much heavier shell up against X-Terminators (proportionally) lighter and slower disc. Typhoons greater force would have, and did easily knock X-Terminators disc out.

Vertical Spinners have a poor track record against, but thats simply because building a robot with a fast, heavy, horizontal spinner is a lot easier than with a vertical one. Horizontal Spinners have the ability to carry much more force behind each hit than your average Vertical. For this reason, though, I would pick Anyeurism to win.