Costco or Sam's Club?

I came across an interesting comparison on a message board the other day. A woman was debating whether to get a membership to Costco or Sam's Club so she went to both and compared prices on a random sampling of items that she uses. Below is what she found, with the "winner" indicating the store with the lowest price on each item:

Product Size Price Winner
Mayo, 1 gallon $6.36 - Sam's
Choc. Chips, 72 oz. $8.38 - Sam's
Onions (yellow), 10lb $3.90 - Sam's
Onions (white), 5lb $3.24 - Sam's
Huggies Diapers, 176 ct. $34.66(.22 ea) - Sam's
Dishwasher Soap, 2-125oz $7.85 - Costco
Fresh Strawberries, 4lb $5.99 - Costco
Sour Cream, 3lb $2.79 - Costco
Chicken Broth, 12pk (14oz) $7.84 - Sam's
Silverware(plastic), 390ct. mix $9.52 - Sam's
Peanut Butter, 2pk-48oz $7.28 - Sam's
Olive Oil, 5lt. $25.79 - Costco
Hamburger, 1 lb (10%lean) $2.25 - Sam's
Frozen Chicken Breasts, 6lb $12.88 ($2.14/lb) - Sam's
Tilapia, 3lb $11.88 - Sam's
Salmon, 3lb $15.56 - Sam's
Frozen Mixed Berries, 3lb $7.32 - Sam's
Frozen.Strawberries, 6lb $8.16 - Sam's
Frozen. Blueberries, 3lb $8.79 - Sam's
Frozen OJ, 6-16oz. $8.69 - TIE
Blocked Mozzarella Cheese, 5lb $11.78 ($2.36/lb) - Sam's
Block Cheddar, 5lb $11.89 ($2.38/lb) - Costco
String Cheese, 48oz. $8.28 - Sam's

The clear winner here is Sam's Club by a mile. Shocking. I guess I'll keep my Sam's card.