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You really need to visit the store to decide. We have four Costcos around us and three Sam's. They are all different. For example, one of the Costco locations has a far better alcohol selection than the others and we will not go in one of the Sam's while the others are fine. I also purchased a clock radio at one Costco that was $10 cheaper than the other Costco locations.
I am not really a fan of either since neither has much of a selection. For example, if you want cereal, Sam's and Costco carry a few brands, while the local supermarket has an entire aisle to select from. If they carry what you want great otherwise you need to either eat what you do not want or shop elsewhere.
Of the two, I prefer Sam's since I can purchase in smaller quantities. Costco only sells milk in two gallon boxes, while Sam's sells milk by the gallon. We do not purchase produce at Costco since we must purchase in such large quantities and a lot of it would rot before we could finish it. If you have a large family this is not a problem, but it is with just the two of us.
Sam's also carries brand name pet food while Costco only sells their brand. My cats will not eat their cat food and my dog gets flatulent with their dog food.
I usually purchase meat at the local grocery store since I purchase choice and the supermarket is cheaper than Costco due to weekly sales.
Currently, we have Costco for the gas. My wife drives a long distance to and from work and Costco is on the way. The gas savings alone is enough to warrant the membership. We visit the store maybe once a month.
I have had a Harbor Freight Dutch Oven for years and I have yet to suffer from lead poisoning. Two of the symptoms are loss of appetite and weight loss and I have most definitely not succumbed to those!
What does differentiate the Harbor Freight from a better quality dutch oven is where the lid meets the pot. On my Camp Chef, both of these surfaces are flat and make a good seal. With the Harbor Freight, however, there is a little waffling and the two do not meet as cleanly and the seal is not as good. With that said, I still enjoy the Harbor Freight Dutch Oven and would recommend it to anyone as a good value.