I have coarse and fine buffing compounds that I bought at Lowe's. The coarse (white) takes out sanding scratches pretty fast but leaves a dull finish. The fine stuff (green) makes the material bright and shiny. A quick search makes it look like Tripoli is coarse and White Diamond is fine.
I do have three 4" wheels that I have marked appropriately for each compound. I have a soft spiral stitch wheel for the Carnuba, a soft spiral stitch for the White Diamond, and a firm spiral stitch (yellow) for the Tripoli.