I would have to agree with Reggaemon. Which one is my favorite would all depend upon the task. So my favorite at any particular time may be based upon which I have recently used.
I just made a batch of my from scratch chili, which involves making my own chili powder, from dried chile peppers. So today, I'm going to say that my favorite appliance is my spice grinder. It makes that task of grinding my chiles up, a sinch.
But next week I'm going to make a batch of ice cream. So if you were to ask me next week, I would probably say that my White Mountain ice cream maker is my favorite appliance.