We're an Apple family. iPhones, MacBooks, iPads, Apple Watches. And I appreciate the priority that Apple puts on privacy. But...
I use Alexa for all of my smart-home functionality. HomeKit is behind functionality-wise, certain device types are hard to find or too expensive (e.g., cameras), and they have no similarly-priced equivalent to the Echo Dot. Oh, and I almost forgot to mention that Siri is the most awful of all of the "smart" assistants I've ever tried out. I even have a CarPlay head unit in my car (that I added afterwards) and Siri frustrates me more often than it gets any request right.
Whoever is in the "lead" on these things can change, so I do make it a priority to *try to* buy devices that are compatible with all 3 standards (Alexa, HomeKit, and Google Assistant, or whatever Google calls it). So one of my first purchases was a few Lutron Caseta smart-dimmers and the Lutron hub. It works with all three standards. Sadly, Lutron absolutely rapes you on the price of their smart-dimmers, and over 2 years later, they're still charging about $60 for each dimmer. I can only imagine the profit margin they're making on those things. Leviton was too late to the party. They are pricing theirs a bit lower, but I don't want to have two different style dimmers around my house, as that will just make for an inconsistent (poor) user experience, so I'm stuck with the Lutron Casetas until we change houses.
Similarly, I also bought the ecobee thermostats (I have 4 zones, so I had to buy 4 - ugh). I liked the style of the Nest thermostats better, but I went with the ecobee because it supported all 3 standards. The little remote temperature sensors were a nice feature, too.
When it came to buying smoke/CO2 detectors, though, I just bought the Nest models. Other options at the time had mixed reviews, and I figured I'll never need to "control" my smoke detectors via Alexa or Siri, anyway. So long as it had an iOS app that could alert me to issues, that was good enough.
I also have a couple of Wyze cameras. They're super-cheap, are constantly being upgraded, and even work with my Echo Spot (which, again, is another neat device that Apple doesn't offer anything to compete with). The Spots are a little too price to put in every room of my house, and I honestly don't need a screen in every room anyway, so the other rooms get Echo Dots, which are super-cheap at $30 or whatever. Again, Apple offers nothing to compete with this, and even if they did, I don't think I'd enjoy dealing with Siri.