The biggest difference between the coolers and a food-safe bucket is if your storage space is small. Most people need a cooler more often they need a bucket that has to be reserved for food use only. I get pickle buckets for free, but someone always seems to grab them for some other use. Also, the dogs love to steal the bucket lids if they are not stored high.
Two Weber daisy wheel kettles A: 1979 P: 1993, and an unused ECB