I wonder why some people always assume that there is an absolute best of everything? You often read questions such as: What is the best Camera, lens, film, developer etc. The best way to find out which film(s) are the best (which comes down to each individuals own personal preference), is to buy some Kodak, Ilford, Fuji or what ever takes your fancy and then see for your self which films you like that suits you best. Asking what is the absolute best of everything will vary widely depending on who you ask.
Basically you are absolutely right.
But it is often not so easy. You have to test the film, developer and all that under different light. So this needs time with all available films.
Personally I would only buy stuff you can rely on for the next years. So Ilford or Fuji.
I had the Acros in 6X6 in ID11 1+1. Perfect if you want a sharp, finegrain film, it does not curl, very flat and is easy to scan, if you want to work hybrid.
So I can recommend it.
But if you use a Delta, I am sure, the difference will be small.
If you use something else, I am sure, your results will not suffer that much.
But basically, this is my opinion, you need some grain in b&w. This search for grainless pics is often guided through what you see in the internet. But in reality, a b/w silverprint needs to show more or less grain to look good.
So if you come to the same conclusion, take a more traditional film from Ilford, FP4.