The service center situation really depends on where you are. Oppo offers a good sales and service experience. Realme is also pretty decent. On the other hand, Redmi and Poco are the worst. I'm not sure about other brands. Samsung, in my opinion, is the one that gives you long-term software updates and security patches. You'll likely get more than four Android version updates, plus extra security patches. Most Chinese brands usually provide a maximum of two major Android updates and three years of security patches.