The feature sets of these two TVs are broadly aligned — both offer a built-in smart TV platform, AirPlay, Google Assistant, smartphone remote support, USB recording, voice commands, and identical standby consumption of 0.5W. The meaningful divergences come down to three points: Alexa compatibility, the remote control design, and power consumption. The Samsung adds Alexa support on top of Google Assistant, giving it broader smart home integration for users already embedded in Amazon's ecosystem — a genuine convenience if Alexa-controlled devices are part of the household setup.
On the remote, the Samsung includes a rechargeable remote control while the Xiaomi relies on a conventional battery-powered one. Over time, a rechargeable remote eliminates the recurring cost and hassle of replacing batteries — a small but consistently appreciated quality-of-life advantage. Power consumption runs in the opposite direction: the Xiaomi draws 75W during operation versus the Samsung's 95W. That 20W gap, accumulated over years of daily use, translates into a measurable difference in electricity costs, giving the Xiaomi a modest long-term efficiency edge.
On balance, the Samsung QN48S90FAE holds a slight features edge — its additional Alexa support and rechargeable remote add meaningful everyday convenience that the Xiaomi lacks. The Xiaomi counters with lower power consumption, which matters for running costs, but for users prioritizing smart home flexibility and remote usability, the Samsung's feature set is the more complete of the two.