I think as stated consistency is the key. I slightly overfill, tap once, and once only, then cut. But the guys who say they don't tap have way more experience than me.....

To answer your original question, I think the kind of measure with a funnel that swivels out of the way is the best for me. That way, I fill it, cut if off at the top with the funnel, then use that to load my rifle or refill my powder containers.