If you do decide to use the cat print as a border, I much prefer it with the turquoise between it and the pinwheel body - of the two options given.
I like the red and the print used for the pinwheels - very dynamic looking.
I like the pinwheels - a lot - and I like the cat print - a lot. Not so much together. (You did ask
) - Because the cat print has a lot of colors that are not in the body of the quilt - and because the cat print has a totally different "feel" to me from the main body.
If you have more stash to look through - maybe look for something else for the outer border. Maybe keep the turquoise and pick up one of the darker colors in the pinwheels?
I think even young children can go for bold and dynamic.