When I crochet I usually pick a hook and some yarn and start. I don't always follow a pattern. I knew the larger hook made a larger stitch but I really didn't understand the differences between hooks. I decided to do a study to see the differences. I started with a 2.0 mm hook but immediately found it too small to work with. I jumped up to size 3.0 mm. With each step up in size, I found the stitches easier to do. It became comfortable at size 4.5 mm. I was working with worsted weight yarn and stitching a single crochet stitch. My samples were three rows of 10 stitches.
I hope you can see the change is size. My 9 year old daughter was all about lining things up. The loose ends were driving her crazy and so she had to cut them off. Her alignment was a bit crooked. The 4.5 mm sample got stretched a bit. I would highly recommend doing your own study to see and feel the differences in crochet hook sizes.
The hooks I used were purchases on Amazon.