It depends on the condition of the paint, but Meguiar's #80 has worked good for me.
If you have severe marring, some #83 might be necessary in those areas.
Either product will be slow with a PC, but they will do the job.
#80 will leave the paint LSP ready. #83 doesn't always do that for me. At worst, you would need to follow the #83 with #80.
Some auto parts stores will have both products, but you might have better luck checking with a body supply store.