I first thought there would be a universal best blade...
...but I've found that probably isn't so.
When I started double edge shaving this May, the first blade was, as usual, a Merkur (it came with my new Futur). I didn't have a high opinion of that first blade, I can tell you.
But now, I'm quite sure that wasn't the blade's fault, but my own. The second blade I tried was an Astra, and it worked equally poorly. Now, I get great shaves with an Astra. Again, this experience repeats itself with the Dorco 301s. I actually removed a new one from my razor before I finished the first shave with it. Now, I find they are a competent, though not the sharpest blades available.
I'm becoming of the opinion that as the shaver's skill improves, he will be able to use any competently made blade and get at least a good shave from it. Now, it may not give two, three, or more good shaves. But I attribute that to differences in its initial sharpness, the steel composition, and the coatings on the blade.