Here in the states, Peterbilt may be an “icon”, but then so are Kenworth (same manufacturer), Western Star, Marmon, and even Mack. Any one of these 3 are also known for good build quality, and Mack is also known for their nearly bulletproof engines and transmissions.
Freightliners, Volvo-Whites and Ford/Sterlings are not known as much for build quality, often being fleet vehicles. International is almost always a fleet vehicle here.
As far as motors go, here in the states, 95% of trucks use either ■■■■■■■■ Caterpillar, or Detroit Diesel motors. Macks almost always have Mack engines.