Store credit cards can serve you well in several cases. First is when you spend thousands of dollars at a particular retailer and rewards earned with this store credit card are higher than any general rewards credit card could offer. Using a store credit card, you can save hundreds on purchases at your favorite retailer.
Second is when you are trying to build or rebuild your credit, you may find it quite reasonable to have a store credit card. As a rule, when choosing between a general rewards card and a store credit card, a store credit card is easier to get approved for. Store credit cards report credit activity to one or all three major credit bureaus allowing you to build your credit.
Also, store credit cards are good when you are planning a big purchase. The cards may offer promotional financing at 0% or lower than the average interest rate.