San Marzano tomatoes are the gold standard for tomato sauce, but they can be difficult to find and expensive. Many people wonder if they can use another type of tomato in place of San Marzanos. And Yes, you can use diced tomatoes instead of San Marzano tomatoes in your tomato sauce.  If you do decide to use diced tomatoes instead of San Marzanos, make sure to select a good-quality brand. There're many brands of diced tomatoes available on the market, so you should be able to find one that meets your needs. Just ensure to read the label to make sure the tomatoes are not packed in too much sugar or salt. Ultimately, whether you use San Marzano or diced tomatoes is up to you. If you can find San Marzanos and are willing to pay the price, they are definitely worth using. However, if you can't find them or don't want to spend the money, diced tomatoes will work just fine.