Definitely San Marzano for making an Italian sauce. These are actually counterfeited too so I usually buy an Italian brand if I'm going to buy them.I was suprised to see what was cooked, even slightly.
When I started cooking, sometime in the previous century, diced tomatoes were not available. I tend to buy diced now as well, because I am now lazy. But one chef's theory is that there is a likelihood of fresher tomato flavour if you do the dicing yourself. Ya, I bought into that for a while. It made sense. However, laziness still reigns.
Anyone have a preference for San Marzano?