The 2nd one is the better one. FX-6300 is not as good as the i5 but the GPU on the 6300 build beats out the 750 ti on the first build by quite a bit which is gonna be the part that does most of the heavy lifting while gaming. But they dont specificy which exact parts are used on either build
will it affect performance or lifespan of my pc components?
Some parts are more reliable than others. Things like HDDs and RAM sticks can die out at any second or never die in the whole life span of you owning it. Also they dont specify what PSU is in either build which can also fry the components if they cheap out. But since in general both build are good performance builds I doubt the PSU would be too bad.