I have a 12" CMS (non-sliding). I originally got it to build a deck, and needed the extra capacity that the 12" offers. I personally would be PO'd by the limitations of anything smaller, but that's been my experience and, of course, YMMV. Perhaps the sliders aren't as precise, but I use my CMS for nearly ALL crosscuts (that it can accommodate of course) and it's accuracy is completely acceptable for everything I've used it for so far, but I have not tried for ultra-precision yet. I do have a Wixey digital protractor and recently used it to precisely fine-tune the saw. It's now dialed in pretty nuts-on, so not sure why I would need to use any other method for the sizes it can handle.
Live a life worth celebrating!
Ridgid R4512 Table Saw, 12" Compound Miter Saw, EB4424 Oscillating Sander, R4330 Planer | Bosch 1617EVSPK Router, 1591EVSL Jigsaw, PB360S Power Box | JDS Air-Tech HP air cleaner | Rikon 70-050VS Mini Lathe | Supermax 25-50 Drum Sander | Grizzly 14" bandsaw (Laguna LT14 clone), G1061Z 1HP Buffer | ShopFox Cyclone DC