The higher the impact factor of the journal. Better will be the journal. This is common criterian world wide decided to measure quality & standard in scientific community & we should rely on it .
It depends on discipline. There is no journal in Social Work with an impact factor that comes even close to that of "Nature". Understanding the real value in your field involves a bit of digging. And then there are other issues with this metric in general: http://www.sciencemag.org/news/2016/07/hate-journal-impact-factors-new-study-gives-you-one-more-reason.