Smart Controllers
Samsung Smartthings
Not bad but must have internet at all times. For ever dropping devices and then you need to reinstall them.
Athom Homey
Slightly better and does not need internet at all times if devices can operate locally. Services/Apps that need the net wont work though. Has the odd crash which causes it to reboot at random. Infrared does not work. Some apps need to be regularly restarted, e.g. Osram and Philips.
Fibaro
Probably the best so far