Best is a relative term. To some, the DROID isn't the best phone Android phone any longer. But if your emotional state is dependent on where you phone stands on the spectrum of Android greatness, you have some other problems to deal with other than what you're using to make calls.
The N1 is a great phone and in many ways, it is better than the DROID. Just pure computing power for things like multi-tasking, the N1 will be better because the Scorpion CPU is very, very good; in many respects, better than the OMAP3 processor, even if it has to be clocked higher to do it. The N1's form factor will appeal to a lot more people because it's slimmer, lighter and "feels" better.
In other ways, the phones are the same. The DROID does have noise-cancellation. It's a tiny hole, up by the headphone jack behind the phone. Don't let N1 fanboys tell you otherwise. And still others, the DROID is better:
1) It has a full and true 16:9 resolution screen that doesn't get washed out.
2) It's got a physical keyboard, for some, having one is a must-have, especially for gaming NES/SNESoid.
3) Shoot, it's even got a physical camera button, which until the native camera app has a touch-focus is valuable for consistent in-focus pictures.
Like someone said, they're really just choices. When the DROID gets the 2.1 update, it will really open up the options for people. But don't be surprised when people rush to pick up the N1 because it is an iPhone-like form factor, which many people put a lot of stock in. I mean, 40% of the Engadget review was about how the phone looked and felt.
But the DROID isn't better, nor is the N1. They're just different.