Okay that means mostly shape and color though, and especially shape (since good logos seem to cluster around a limited range of near-blue or near-red colors, or, less frequently, some sort of multicolor/rainbow theme).

So I'd argue that round is very generic since a hundreds of coins have done that. Something based on the square logo, or a variation of it, is more distinctive.

That last one from bangomatic is the best of the new crop by that reasoning, I think. The rest are pretty bad -- generic shapes and weak use of color.