I vote for Lutron Caseta system.
Lutron caseta consumer hub will work with only upto 50 devices including the hub, so effectively 49 devices total (that includes pico remotes, each serena shade).
The commercial hub that comes lutron's dealer installed system ( I guess RR2) has larger device capacity. The way people get around it is to have 2 hubs(if required).
I have lutron caseta switches throughout the house, 3 google homes and apple homekit. The house is 3700 sq ft. The idea is to automate the lights, fans, shades in the common areas. I do not want any of the bed room lights and fans to be controlled by voice command anywhere in the house. So, I keep them on manual switches. With 3 serena shades, 2 plugin lamps, 14 overhead light circuits including pico remotes for the ones that I want 3-way controls, I am at 27 out of 50 allotted individual devices. I am going to add one fan and more caseta switches to the hub. I feel I should be right at the limit once I am done having the basement finished. With basement, I would be at around 5400 sq ft living space and all common area lights and fans controlled by lutron caseta.
Now the reasons I like lutron caseta:
- It runs in its own clear connect frequency. Meaning it wont hog your wifi bandwidth and is not dependent on your wifi or internet. It will work without internet or wifi network.
- The normal light switches do not need nuetral wire, makes it a lot easier to wire them. Hence DIY friendly.
- Works with Google home and Apple homekit.
- Integrates with Smartthings.
- Its really nice that they have come with the fan control switches.
- All devices (if you stay within lutron system) are controlled by one hub/app.
- Expensive. The switches are quite expensive. So, keep that in mind when trying to automate absolutely everything.
- The look of switches is not something I'd have preferred if I had a choice.
Lutron caseta doesnt give you control of HVAC, door locks, irrigation, garage door openers etc.
My advice is to take one system and go with it. I choose apple homekit. Almost every thing that works with Apple homekit works with google home, smarththings etc. I choose apple homekit for voice control and automation because the devices have to implement hardware encryption(at the time of my purchase/2017-18) to be apple homekit certified. It at least gives me a sense of more security.
The door locks I have are schlage sense (homekit version).
The garage door openers are bestbuy's insignia branded ones.
The house locks and garage doors are the only devices that I cant control with google home, and I deliberately made it that way. Because I dont want anyone in the house(or outside) to yell at google and it opens the doors to my house. With apple homekit, I can specify the people who can have access to the automation in the house.
The lights(lutron caseta swithces), shades(lutron serena), thermostats(ecobee 3), irrigation system (rachio), vacuum cleaner (deebot) I dont care if someone wants to operate them by yelling at google home, but the locks and garage doors only work with my and my wife's apple ids. If we give access to anyone else and we are not home, we get notifications in our phones when locks are operated.
I have my own security system with sensors tied to smartthings to send me push notifications for the events. So, effectively I have apple homekit to voice control everything plus notifications and smartthings as a back up for notifications for security. It took sometime but I feel I have it all set up to work how like it.
Good luck with your decision