For zwave switches, I like Cooper. Very nicely engineered, has instant update status, and their RF9500 is a battery operated remote that you can add that looks just like their regular wall switches. So if you care about aesthetics but you want to mix in some battery options, that gives you some choices. Also, I admit, I like their black and silver switch plate option. But like I said, it’s a personal choice. And they are expensive.
There are many good options.
We should also say that the GE switches use physical traveler wires between the master switch and the auxiliary switch in a three-way set up. Most of the other brands don’t, they make the aux a “virtual three-way” where the auxiliary talks to the hub and the hub to the master. There are advantages to both methods. Use of the physical traveler wire makes the wiring set up a little more complicated for the GE’s in some of the non-standard methods, but it also means the auxiliaries will still work even if the Hub is unavailable.
Personally my biggest concern with the GE is reports that some fairly high percentage, certainly higher than other brands, tends to lose contact with the network about three months after the devices are out of the warranty period. The only way to fix it is to cut power to the circuit and restore. (this has nothing to do with Smartthings, you see the same complaints in forums for other controllers. ) As someone in a wheelchair, that kind of “easy fix” isn’t easy for me. This problem has now also been reported in the newer models that do require a neutral.
Pretty much every brand has its own fans. Sometimes it’s something as simple as preferring a green LED to a blue one.