As someone that is building a home and prepping it for the whole automation thing, I've looked into this a bit. iDevices just seem to be better supported by both the automatin vendors (Crestron, Control4, Savant, linuxmce.org) and 3rd party hardware accessories.
For example, I just could not find (before I gave up looking and settled on iDevices at least) a decent wall dock for Android devices. Since there isn't a common form factor for Android devices, hardware accessory vendors don't give the swarm of Android devices much attention.
A shame too really, because I loved my original Droid and now my Bionic. However, iDevices are the ones getting the love.