It really depends on the layout, use case, and what is important to you to monitor. In general Honeywell makes some great, long lasting, wired sensors. Also some things you can install will have mutliple sensors. For example Smart Thermostats will have temperature, humidity, and many times motion sensors built into them.
The other thing to consider is how you want them all wired. You might want to mix wired and wireless sensors depending on what you want and what you want to monitor.
Is there something specific you want to monitor?
I’m curious about leak sensors specifically. The best zwave leak sensors these days are $50-60 per unit. With Konnected, it seems like we could have more options, at least in places where we have wiring.