Ipad air 2 or windows surface 2

[Chris_90]

So last minute shopping thinking of either ipad air 2 or the windows surface 2 for the wife.

Got a budget of £400 max, want to be able to use it for pc like tasks browseing Internet, word documents etc, but also games 

I'm more swaying to the windows one because of the pc side if it.

Needs to be in stock at my local shops 

What would you guys advise or recommend?  

Thanks in advance