For researchers some of them still cannot differentiate between journal with impact factors and journal in Q. It is not the same some journal can have up to more than 10 impact factors but yet still Q3 or Q4. But the basic calculation for impact factors is numbers of citations / numbers of papers...so the more less impact means that more papers were publish in that journal which mean more audience that will read your paper in that journal...and the most important is that the journal is open access then there were be more audience will read your paper because it is free access.....
My personal believe is that the number of citations depends more on the research front than on the quartile of the journal. . In this sense it is very helpful and informative the Citation Analysis of Essential Sience Indicators section of the ISI Web of kowledge.