The first thing to say is that, if you have the confidence to do it, you could build a better quality system yourself. The drawback with pre-built, budget, gaming PCs, is that they tend to use compact cases, with "cheap and cheerful" power supplies, that don't have long-term reliability, and offer very little scope to upgrade, in the future.
That said, the spec on these two (apart from "un-named" PSU) is not that bad. Normally, I would say go for Intel processor, even i3, over any AMD processor. However, the AMD build does have a much better graphics card (the GTX 550Ti, in the other, is pretty c**p), so I reluctantly have to say the AMD build probably "shades it" overall.
Before you make a final decision, check out the offerings from CHILLBLAST. They do a couple of low priced gamers, that are worth at least considering. Although, as I said, nothing much wrong with your current choices. I know Chillblast are pretty reliable, the firm you've chosen may be brilliant, I just don't know. Make sure you check out some user reviews, to satisfy yourself.