Scale vs Dimensions

While doing the challenge, I got away for re-scaling the new meshes with the “dimensions” in the right, but then I saw “scale” as well. Both end up with the same result but on the long run, which is better to use and what’s the difference ?, does it have to do with number of polygons ? one downsizes while the other removes?

Thank you

Never mind, stupid question. was thinking of something else. Figured it out.