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What really matters is checking out people's reviews in your specific area, because a bad dealer will ruin your experience even if the brand is good. I had a Mazda years ago and the technical service was incredible - fast and honest - while a friend with the same model in another city was constantly complaining about the workshop. Volkswagen also has a good reputation in several places, though they tend to be pricier. My advice is that before you buy, talk directly to the service department, ask about repair turnaround times, and check what people are saying on local social media about that specific workshop!
It depends a lot on where you live because the dealers vary quite a bit. In my experience, Toyota and Honda have a pretty solid and reliable service network, though they're not always the cheapest. Hyundai and Kia have improved a ton in recent years and offer generous warranties with decent service. The best thing is to ask around in your specific area, talk to people who own those cars, and check what authorized service centers are nearby before you decide.
Mercedes and BMW have pretty well-organized service centers, though the prices are what really stings. I've had mixed experiences: a Mercedes dealership in a big city was impeccable, but when I had to go to a smaller one things moved slowly. In the end, what makes the difference is whether the dealer has parts in stock and whether the mechanics are properly trained - something that varies more by the specific dealership than by the brand itself.
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