I’m going against the grain here, but hear me out.
For me personally, I don’t see the value in staying with one brand; I would rather have the best devices for my particular situation, in whatever category. I love my Aqara curtain drivers and indoor cameras, and I have a couple Aqara switches (older home, no common wires). But I don’t have electrical outlets outside (again, older home), so the outdoor Aqara cameras don’t really work for my situation. I have shades and blinds, plugs, a thermostat, light bulbs, lamps, and a humidifier, all from different brands. I also use Google Home for a few things and pull those into Apple Home with a Starling hub (sadly no longer made). One of the most common things in my home is a mini switch used to control LED lights, that I use to adjust lighting throughout the day in my fish tanks, made by a brand most people in the U.S. have never heard of. So I recommend going to multiple forums, and Reddit, and figure out what will work best for you. And if it doesn’t work, you can usually resell it.
I do agree with one thing several folks have said here, which is to figure out what you want the devices to do, and work back from there.
Use ZigBee and Thread as much as possible and practical. Have fun with it. And if it doesn’t make your life easier, get rid of it.