I run Meguiar's pads and compounds, so far I'm pleased. Usually I wetsand with 1500 and go over it with 2000, Meguiar's Ultimate compound, finish it off with Meguiar's Swirl remover and I'm done.
Perhaps you're not sanding out scratches with finer grit sandpaper like you're supposed to do. Instead of that you're trying to polish those scratches out.
You're better off sanding with next finer grit of sandpaper than trying to cut those scratches out with compound imo.