B5 brands and prices

I went to www.swansonvitamins.com and found two different brands of B5 vitamins.

One was Swanson Premium Brand Pantothenic Acid 500 Mg 250 Cap and the price of it is almost the same as Twinlab
Pantothenic Acid Caps 500 Mg 100 Cap.

I don't understand the difference between these two products. Anybody knows? Could it be the quality? I really need a quality B5 product but I can't really pay a lot.

Any help would be appreciated. Thanks.