The xiaomi devices are for now proving to be as reliable as any Samsung offerings 
there’s a thread here with lots of discussion and device handlers for the motion/contact/button/temp&humidity [OBSOLETE] Xiaomi Sensors and Button (beta)
The orvibo stuff is pretty stable & reliable too. Infact anything that @a4refillpad releases a device handler for will play nicely with smartthings 
I’ll add this too because of your ? after xiaomi. ‘Mi Home’ is also a name used by energenie for their products, whilst there are device handlers on here to use them, they use a different protocol not directly supported by smartthings and need their own hub.