From a design perspective , there seems a clear winner. And live.com algorithm is getting better.
Google.com Vs Live.com
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DECISION STATS 
Google is the leader but the gap is reducing due to Microsoft efforts, thanks to its policy of not making any design changes since 7 years.
try going to http://www.ask.com, http://www.cuil.com and http://www.live.com to see the difference
I am not sure what your choice is, but speaking for myself, the “clear winner” to me is Google.