Tsvetta Kaleynska says there's "two different flavored stories" you can find between Costco (COST) and BJ's Wholesale Club (BJ). She attributes Costco to a "theme park for adults" that shows positive retail and sentiment trends, along with a surprising customer taste for high-priced items. However, Tsvetta explains how BJ's shows a greater push for a value-oriented shopper. Tom White takes traders through an example options trade for Costco ahead of next week's earnings.