I was referring to tinned tomatoes, whether they be plum or chopped.
I've recently switched from using mainly chopped to mainly whole tinned tomatoes - I buy whichever are cheapest or on special offer. I believe they are the same tomatoes but the chopped variety are just that - broken up, like the difference between a loaf of bread, and sliced bread.
In a base, it must be irrelevant because both are pureed later. In any event, the whole tomatoes break up quite quickly. I probably prefer whole tinned tomatoes, in general.