Battery Consumption on Wifi or 3G

In The Country I Live - 3G Released A Month Ago - I Got The 3G Services and is using it on Z10 - I Wanna Know that 3G Consumes more Battery or Wifi ???
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Big thanks for your answer - very helpful
So am I right in thinking that if the phone can find my wifi network it should make use of that first and only if no recognised network is available will it jump to 3G?
Any idea what happens for apps like skype that (I think) won't work on 3G - do they try and find a wifi network source automatically?
Thanks again for any info

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