I use either 3D Speed, Duragloss 101 Cleaner Polish, or Meguiar's M06 Cleaner Wax.
M06 and Speed are similar in defect removal / masking. But neither last as long as Duragloss 101. There have been times I've been very surprised at what 101 made look better, and the degree at which it did. I like black Buff and Shine pads and my Porter Cable 7424 xp at speeds 4-5. The abrasive in 101 is very fine. Bill told me is was a lot like the abrasives in the pastes dentists use to polish teeth. So, I work it in a way that will make most use of those abrasives before they diminish away. The protection approaches the level of 111, which is the longest lasting sealant I have ever used. 101 gives a great gloss to even white and other light color paints. 101 can be topped with 111 and / or Aquawax, and maintained with their Fast Clean & Shine detail spray.
M06 is so nice. It smells incredible, really deep cleans the paint and either removes or hides whatever defects are in the paint. The longevity lacks a but the trade off is a fast working, highly effective product. The Shine is beautiful, and slick. Like 101, it's an "ols school" product, but still can compete.
3D Speed. This stuff is a joy to use. I like that it behaves a lot like 3D One in that it allows for a long cycle time. That combined with 3D's non diminishing abrasives allows for better defect removal potential. I let it set on the paint for 15 minutes after I've applied it, and the water beads are small and tight. The treatment I gave a friend's car was holding up strong at the 1.5 month point. Another customer whose car I maintained, got Optimum Opti-Seal as a drying aide after an ONR wash. That thing looked great and cleaned up so easily. When removing Speed after application, the wipe off is almost rewarding. You get that ever so slight resistance, but the subsequent glide is something to experience.
An honorable mention goes to Optimum GPS for it's ease of use, and Meguiar's D301 Finishing Wax. D301 Reminds me a bit of Speed.