Welcome to the forum.
From a quick glance, it appears the difference in price is mainly due to the CPU. Since they are both old processors, I can't help you in which one is "better", but I can help you get better help. The other factor in price difference is the hard-drive space, but not as much as the CPU.
First off, we need to know what your intended use of this laptop will be, so we can be sure that you are buying something that is powerful enough to meet your requirements. After that, perhaps we could also help find better alternatives.
And as a side note, 8GB RAM is far more than enough. Note the build in my signature, nearly top-of-the-line, still only using 8GB RAM. Unless you need to run multiple memory-intensive programs simultaneously, you won't ever use that much RAM. You'd probably even be fine with 4GB, but we need to know more about what you need the laptop for.