Having Google Voice integrated into Android is a huge advantage over any telecom routing/transcription/service. While it is available as a web service on Windows Mobile and a third party app on the iPhone, having the service integrated changes everything.
Quite simply, if you don't use Google Voice yet, you are missing out.
Bonus: Cost. While retail prices of high-end Android devices are often as high or higher than the $199 AT&T plan currently offered for the Windows 7 series and the iPhone, third parties like Amazon and Wirefly bring costs down considerably.
Also, AT&T's plans are as expensive as any in the US. Sprint and T-Mobile often offer discounted monthly data plans which will, over the life of the phone, save consumers much more than the phone's price.
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Last updated November 08 2010: 2:25 PM ET