You've got a very difficult, if not almost impossible choice there between 3 really great top-notch razors Felix.
I would base your purchase decision as follows:
If you like and want a standard OC then the Wolfman is streets ahead of the others.
If you prefer slants then ATT is the definite way forward.
If you want a DE that cuts as well as a slant and is best used like an SE then the Blackbird is the only razor of this type in existence.
The build quality on all 3 is excellent.
I would rate the aggressiveness as being (with the most aggressive first) Wolfman, Blackbird, ATT S2.
In terms of smoothness I would rate it as (with the smoothest first) Blackbird, ATT S2 and then Wolfman.
In terms of ease of use, the Wolfman and ATT are very easy to use. The Blackbird has a much greater learning curve, but when you hit the sweet spot it sings very sweetly.
My choice out of all three would be the Blackbird.