I've used both and I think both are okay. The problem with Costco is that they have a limited selection of tires and I've also found their wait times to be long and I only last about 5 minutes when wandering inside a Costco before I want out of there. Discount/America's Tire has more of a selection usually, is faster about installing the tires usually, and is excellent at fixing flats with no fuss. Their prices are usually about the same as Costco but if not they price match pretty readily.Which stores do you recommended? Costco or America's Tire?
A story - I once bought some tires for an SUV at Costco but settled for something other than what I really wanted due to their lack of selection. I think I ended up with BFG rather than Michelin. After driving on them for about 20 miles or so I just couldn't get over not liking the ride, handling, noise of them and had some buyer's remorse. On a whim I went to Discount Tire and explained my situation and asked if they'd consider something like a swap for the tires I really wanted, which they had in stock, not really expecting them to do so without at least a big cost hit to me. They checked out the tires on my vehicle and ended up giving me the full price credit on the tires, i.e. what I paid Costco, and credited that amount to the Michelins I wanted, and which had a good price on them in the first place. I went through with the swap and was very happy with them and they continue to get my business - but I do price check against Costco each time regardless - but Discount tire has always matched up well price-wise against Costco.