The big Kronos (Pro) can do 12" arms. The Sparta are limited to 10.5". I don't think I could afford a Pro. The base Sparta is something like 15K without the arm.
I'm not sure of the advantages/disadvantages between 10.5" and 12". In theory better tracking?
Much lower tracking distortion, and less susceptibility to variance in VTA from records of different thicknesses due to the increased distance from the pivot point. IME a pivoted 12" arm provides the least compromises of all available arm designs. Tracking distortion won't be "perfect" like a tangential tracker (except at null points where it is perfect), but tangential trackers are rarely
ever perfect, at least the ones below the extreme air bearing designs like the Kuzma anyway. And assuming the cartridge was made properly, and the correct alignment was used, the distortion that is there will be low enough to not really matter.
A 10" arm limit on a $15K table IMO is a total fail - my ~$4K Nottingham has the 12" Ace 294 arm made just for it, and everything above mine in the line uses the 12" Ace Anna. I would much rather have a 12" arm on a Spiral Groove or Dr. Feickert than a 10" arm on a Kronos. It costs a couple of hundred bucks more to get a 12" Graham Phantom for example over their 10," and you'll get a MUCH bigger improvement from that upgrade than any record clamp or other tweak for similar money.