Comparison
Smart bulbs: Wi-Fi or Zigbee, which should you buy?
Wi-Fi is cheaper and needs no hub, but every bulb becomes another device on your network. Zigbee costs more and wins at scale. The tipping point has a number.
Smart home
Voice assistants, smart speakers and home automation.
Comparison
Echo Pop vs Echo Dot vs Echo Show 5: which to buy
Alexa is identical on every Echo. What your money buys is the speaker, the screen, the sensors and the hub, and that is what should pick the model.