Devices
Each of the individual device-type pages have information regarding various devices I have used and considerations in each category. Apple also has a HomeKit Accessories page that it maintains which lists HomeKit products available by category (although it is not always complete or updated regularly).
Here is a one page summary of HomeKit devices I have found to be reliable:
Wi-Fi: NetGear Orbi RBK50 Mesh Wi-Fi System: Reliable, Good Performance
Hubs: AppleTV 4K: HomeKit Hub plus Movies, TV, Games, Music, Photos, (with a better, more consistent interface than apps built into a TV)
Audio: Apple HomePod: HomeKit Hub plus Whole House Sound, Siri (Great Mics! with Siri control of HomeKit plus general Siri features)
Lighting: Lutron Caseta: Rock Solid Reliable, Easy Install, No Neutral Required
Outlets:
iDevices Wall Outlet: Eliminate unsightly adapters; Two Smart Outlets; Energy Monitoring
iDevices Outdoor Outlet: Energy Monitoring; Hasn't failed yet - two outlets, but not individually controlled
Satechi Dual Smart Outlet: Two Smart Outlets; Doesn't block both outlets; Energy Monitoring
Meross Smart Plug Mini: Simple, reliable, and cheap
Locks: Yale Assure w/ August Connect YRD226: Variety of styles/options; August Connect, HomeKit, Key, Touchscreen
Sensors: Onvis Smart Motion Sensor: Battery; Motion; Temperature; Humidity; 31 days of history; Bluetooth
Cameras:
Thermostats: Ecobee SmartThermostat with voice control
Doorbells: Logitech Circle View Doorbell
Shades: Serena Shades
Garage Door: iSmartGate: Reliable; allows you to select whichever garage door opener you want