iphone 4 vs iphone 4s wifi speeds

Iphone 4 vs iPhone 4S wifi speeds
location: apple.com - date: January 6, 2013
Just wondering if iPhone 4S is "more powerful" or has better wifi than the iPhone 4. I have 4 and my wife has 4S. Using Speedtest.net app on both she regularly hits 34mbps download and 10mbps upload on the 4S whereas I usually get 14-18mbps download and 8-9mbps upload on my 4. Can't understand why.  AppleCare have said they should be similar speeds as both have the same wifi chip. Called local Apple store but couldn't speak to Genius. Whoever I spoke to said speeds should be similar on both and a Genius Bar appointment may be an idea. Anyone else noticed something similar? Apple store is a fair distance and don't want to travel down to be told nothing is wrong. Appreciate any advise.
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