Give me a little more info on what you'll be using it for, and I'd be happy to help make a recommendation.
Your own car(s)? Buffing paint for other people? Using it daily as a professional?
Old Paint? New Paint? Base/clear? Single stage paint?
What kind of buffing experience do you have?
Full disclosure; I work for RUPES, but I understand our tools/systems don't fit the bill for everyone out there.
Do you have any experience buffing/polishing?
I have a porter cable because a fella by the name of Dylan who I talked to on other forums and who also now works for Rupes advised me to buy because I was wanting to get my feet wet and it’s basically impossible to burn clear coat with it.
That said though it does take longer and does have its limitations in correcting power and a rupes in on my list but not budget currently.
Quick few passes with a Porter Cable with some older Adams polishes on a single stage paint job.
What he said ^^^^^......chat with Nick here, I’ve read his posts elsewhere also and he’ll steer you in the right direction!
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That’s a great combo for a beginner who is just looking to shine up/maintain their own vehicles.
I worked at Adams with Dylan for a few years as well. Still have a LOT of Adams chemicals in my garage. Great stuff for the hobbyist, very effective, safe, and easy to use.
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For polishing paint, you're safest using a Dual Action (or orbital) polisher.
Middle Of The Road/"Everyman" suggestion: Griot's Garage 6" orbital (~$150). It will do all that you need for a hobbyist doing an occasional paint correction. Their Boss 21 is the next big step up from that brand, but it's also more expensive.
Low-buck/"On a Budget": Harbor Freight 6" DA (~$55) While cheap, these have plenty of power and durability, and with a quality backing plate will do the job just fine. If you're worried about longevity of use, you can always take apart the head of the unit and pack it full of good grease. I have one that I've used for 5+ years on over a dozen vehicles, and it still works great. I've retired it to 3"/"cutting in" duty, but still use it frequently for smaller jobs, too.
Top Dollar/"Professional Use": Rupes Bigfoot or Flex 3401 (~$400+) These are the big boys of the playground and they do NOT mess around; they have substantial amounts of correcting power with unmatched smoothless and durability. While expensive, if you plan on doing 5+ cars a year, these are an investment in your time and fatigue. I bit the bullet and bought a Rupes Bigfoot LHR 15 Mark 2 this past year, and it as been a long time coming for the amount of paint corrections I do. Buttery smooth, wrecks RIDS with ease, and helps final steps finish down much, much quicker.
As with anything, any one of these machines is only as good as the pad and compound/polish you use with them. For all three, I'd suggest Lake Country flat foam pads for polishing and light compounding (they're available with different foam for different purposes), and for the heavy cutting, any name brand Microfiber cutting pad or Wool cutting pad will make quick work of the heavy stuff.
For compound, Meguiar's M100 is hard to beat for the money, performance, and ease of use.
For polish, Meguiar's M205 is a staple, and is also hard to beat for the money, performance, ease of use, and availability- most parts stores carry bottles of the stuff on the shelf.
Source: Been doing paint corrections, ceramic coatings, and other detail work for the past 4-5 years, and have done a ton of trial and error.
As previously said, it looks like your car has a matte finish on it; you likely won't be able to "polish" it to gloss paint. The clears/paints used are two separate worlds apart and behave as such.