Why is yarn not sold in balls?
The biggest reason yarn so often comes in hanks is that it travels much more reliably that way. Wound balls tend to snag, fall apart, and generally become tangled knots. Also, leaving yarn unwound is usually better for the fiber for storage.
Is it better to pull yarn from the center?
But when it comes to using the yarn, the two styles make a difference. Pull skeins are longer and more narrow, and are designed to be pulled from the center. Pulling from the center is neater overall and the yarn won’t roll around.