I like the ecobee. We are installing a 'customer supplied' Nest this week while perfoming his system's scheduled maintenance. Only installing it as we do his A/C work. I don't like that they can get the Nest at the big box stores.
Therefore, I have a grudge against the Nest, and like the ecobee, lol.
Honeywell has a new one out that I have not yet tried. Some here will pipe in with their experiences on them. I await their input as well.