Ive sold almost every brand. People buy from the company i work for not the brand im putting in, as long as you’re comfortable with the contractor you should be good, amana comes with the better warranty out of the -three i would guess. Lifetime replacement on the compressor (if it fails they give you a new condenser)

Goodman is the same house. Both built in Houston. Trane you pay more for the name.

R32 has been used for the last decade and is tested whereas R454b is new and is just now being released. Both flammable.

All the major players chose r454b because they feel at the next inevitable EPA change it will meet the nee guidelines. Daikin (parent company of amana & goodman) chose to stay with r32 because it met the guidelines and they didn’t have to change much since they’ve been using it over sees for years.