forget any of the ones in the auto express test, all but one would be far to big for regular cars, The Meguiars G220 potentially could burn through unlikely, a rotary is the monster polisher in untrained hands.
Check out this test... it contains polishes and waxes which do 2 completly different jobs.
Car polish test | Products | Auto Express
Polishes...
carplan ecocar polish
Nielsen flawless polish
Comma car polish
Waxes...
Collinite 476s
Collinite Marque d’Elegance
Sonax carnauba care
Autoglym high definition
What is it you want the polisher for if its applying wax, there is little benefit doing it by machine.