I like hard pads better than cloth. But out of the tons of hard pads I've bought, I've only liked two or three so far:
1) Insignia Hard pad from Best Buy (which replaced the Rocketfish hard pad? Maybe same company? Looks same?) - If your mouse feet, DPI, and all the other stars align, this is one of the most consistent, accurate, hard pads there is. There's very little grain, so the surface gives you a very linear flick, unlike most other hard pads that are designed by absolute buffoons where the amount of force and friction during starting movement, mid movement, and stopping movement are all highly different giving you similar problems as mouse acceleration in terms of accuracy due to differences in friction being all over the place.
The main problem most hard pads have is they either achieve linear movement by giving you absolutely zero friction and control through the course of all movements, or they throw linear movement out the window and give you more friction and control starting from a stand still, but then have zero friction after you get moving. The pad needs to be linear and consistent through it's entire range. This is one of the few hard pads that actually does that.
2) Steelseries 4HD - was discontinued and replaced with the "QCK Hard", which is much faster and out of control with less accuracy. This pad is worth mentioning and feels pretty good, but would be hard to recommend as top choice because this pad's speed is more affected by things like moisture or grease on the surface than just about any pad I've seen.
The difference in this pad being freshly wiped off with a wet paper towel vs having been used for a few days is enormous in terms of cursor speed. It's much slower freshly cleaned while the oil from your hands or whatever turn this pad into the speed of a greased hog after a day or two of use. In other words, this is one of the most inconsistent pads in existence unless you clean it every day. Pads like the Insignia above are far far less affected.
3) Razer Vespula v1 - was discontinued and replaced with a dual side pad with cloth + control side, but the 'speed' side from v1 was the only good side in the first place, so they essentially deleted the good part of the pad. I'm speaking entirely from memory, but I seem to remember this pad having pretty linear movement on the speed side, as opposed to the issues I talked about above.
As for other hard pads, I've tried stuff like the Logitech G440, and it has the 'greased hog' speed of movement with next to no friction and control through the entire movement range as described above. I'm not sure who can actually use pads like these. Maybe 400 DPI players? Even 400 DPI players would probably overshoot though? Same issue with the new 'QCK Hard'. Then you have pads like the "Blade Hawks" hard pad.
This pad is decent and kinda similar to the Insignia/Rocketfish hard pad, but the pad itself seems thicker + has thicker rubber pads on the base? So it kinda sits too high like a 4x4 truck compared to the Insignia hard pad. The Insignia is thinner and does have the problem of warping a little too easy, so this does solve that problem. As for alternatives, I haven't really seen any good alternatives. Most hard pads seem to fall under the category of absolutely no friction or control and unusable, or they use a generic Razer/Rocketfish 'control' side which is too rough like driving on a gravel road, while the generic Rocketfish/Razer speed side without the pot holes in it is the far better option.