One of your main considerations should be licensing, if it is for a commercial website. You will need to contact both Google and Microsoft to obtain accurate information and pricing, but there is a lot of information on the Internet that it can cost you $ 10 thousand. To implement these solutions in production. They make you depend on quick and easy development, though!
My preferences relate to Google Maps, it just smoothes out a bit, but earlier I developed some good prototypes with the Virtual Earth SDK.
I donβt know if Microsoft is planning an equivalent of StreetView, so if itβs on the call cards in the future, stick with Google.
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Google Maps for Enterprise :
http://www.google.com/enterprise/maps/map_info.html