AMD Phenom 3.4Ghz or Intel Core i3 3220

I'm looking to upgrade my second PC build but need help. Currently the motherboard is a socket 1155 motherboard and so will only support intel processors. I can buy online an Intel Core i3 for £90. Or should i switch to my newly found interest in the AMD option. I would have to go out and buy a new motherboard for about £60 and for it to serve as a temp but decent motherboard. With this i would buy the AMD Phenom x4 3.4Ghz for £67. Which will serve better in performance? I need help!!! PLEASE REPLY :)

If you want to overclock then the AMD if not the Intel (assuming gaming)