I agree about di Cecco, it’s probably the most easily available decent dried pasta, and well worth the little extra.
I tend to use mezzi rigatoni or penne, just try to use something that works with the sauce. But if you find yourself with just spaghetti to go with your ragu it’ll be fine. I rarely use spaghetti, the stuff you can readily get is just too insubstantial, I’ll use spaghettoni if I’ve been lucky enough to find any, or maybe linguini or bucatini.
serving pasta with the sauce dolloped on top
Don’t.
The only time you need to be meticulous about draining pasta is when you’re not dressing it, using it later in a salad for example.