I have one version of the small round looms you offer. I was experimenting with some variations on a knitting pattern and tested them on this little loom. It has more pegs than the set of your gage testing straight looms I have and let me knit a couple of pattern repeats with borders on each side. I learned a lot. When I started knitting the scarf on a wider, straight loom, I felt fully in control from the beginning. I have just ordered three more of these little looms in various sizes and gages.
P.S. I used the little loom I have to make golf club head covers for the irons belonging to the guys in our family. Custom colors of their schools and the clubs where they play.