Knit thru back loop vs front loop?

[XxavoOo]

When I learned how to knit, I learned that a knit stitch was done through the back loop, and the purl stitch through the front one. In stockinette/ribbing on the flat, this is the easiest way to do it.

However, when I began knitting on the round, it was hard to do ribbing like this. So I did some research and found out that you could knit through the front loop and purl through the back loop. Thus, in the round (when ribbing), I do knit sts on the front and purl sts on the back.

Is there any difference on the result of your knitting when you knit through the front or back loop?