CCS or Hex Logic are my all time favorites.
The only time I'd advocate flat pads is when using a diminishing abrasive polish, but even then I've had excellent results using diminishes with CCS or Hex pads.
I wise the Hex pads were available in the 1", 3", 5", and 6" sizes.
At work we tested the blue HDO flat and CCS, and the CCs was so much nicer to use. It glided over the paint with ease, where the flat would jerk the polisher around more. On a 8mm tool it might nit be as big of a difference, but on the 15's we use at the shop, it was very noticeable.
The foam also has something to do with the feel as well. The denser pads like the HDO, or the Orange, and Yellow flat pads seem to exhibit a less desirable user experience than the Green and Blue Buff and Shine flats (same foam as the Hex Logics). I find the older style foams to out perform the dense pads in cutting, while also delivering a nicer user experience. Unfortunately, CG only makes the full line in the 5.5, and 6" sizes.