These two dolls, from Sandy Nordwall Eggers' BoHo Hippie doll pattern, were made from Worsted Weight Yarn. The one of the left, the smaller, used Bernat Super Value yarn. The one on the right used Red Heart Super Saver yarn. Same hook, same number of stitches.
The Bernat yarn worked up smaller, as it is thinner than the Red Heart yarn:
Bernat - 7 ounces/ 440 yards
Red Heart - 7 ounces/ 364 yards
That is a pretty big difference for two value priced yarns that are both labeled as Worsted Weight/ Medium/4. And you can see it in the way they work up.
Not only that, the Bernat yarn feels cheaper. I do not care for it, and I would not recommend it.
So, where is the best place to buy Red Heart Super Saver? Try JoAnn's Fabrics. If they don't have it in stock, you can order it online. I've tried ordering Red Heart from Michaels...but you have to order SIX skeins for home delivery! I might want six skeins of a skin color, but not for all the other colors. Yarnspiration carries Red Heart, but it is almost twice as expensive from them as it is from JoAnn's.
So, enjoy the day, and enjoy the crochet!