I would suggest a rotary - get a demo panel from the scrap yard, watch lots of Utube videos and experiment - I got a DA and soon switched to a rotary after 3 month to get better results (DA hardly gets used now), as I was going to work on customer cars I went to 3 different companies for advanced training (all had different approach to machine polishing but all suggested rotary) its not as bad or dangerous as people think
regards pads and compounds, I would suggest 3M or Menzerna compounds but get samples as what may work from someone may not work for you and will also depend on your pads.
I think Frank has already offered his services and I would also be happy to be backup help