I have and use both rulers. You ask about differences so here you go. My opinion.... so take it for what it is.
I love the creative grid rulers because they have such great 1/4 and 1/2 inch lines. With the added 1/2 inch on 2 sides and the clear numbers I find them so easy to read. But, they tend to slip on me and that's a problem.
I bought my 1st quilters select rulers a year ago so I don't have any issues with scratches and such. I do keep my rulers in a wooden ruler file so they don't touch each other. As far as slipping, the quilters select rulers are the best I've ever used. I find it a bit harder to read the lines and the yellowish coloring can be a problem with my old eyes.
I'm starting to convert to all quilters select due to the slipping issue. That's the most troublesome problem for me.