At the moment I have yet to find a San Marzano tomato product that lives up to the flavour of the Mutti tomatoes. In my experience, San Marzano tomatoes are overhyped and I have experimented with a few brands. Not only will San Marzano tomatoes cost you roughly double the price of another suitable type of tomato for this sauce, but the texture will also be rather thin and watery. Save your money and put it towards a nice bottle of wine instead :)