its a prooven fact that slushboxes are always slower.. unless you play with the ratios..
even the best autobox is pumping fluid instead of a direct drive if its a real auto.. 
If that were true, you wouldn't see automatics at the dragstrip.
Whereas the opposite is true, manuals are very rare for a number of very good reasons. Consistency, reliability and ease of use for a start.
By the same token, Slushboxes are not very popular at track days.

Horses for courses. What one does well, the other doesn't. I agree that you can't really say one is better than the other overall.
.. and an auto box isn't significantly different to a manual once the torque converter has locked up since it
does offer a direct drive through the gearbox. If the additional losses in an auto box amounted to anything significant we would see much larger ATF coolers on cars so equipped!
Where an auto is poor is that auto boxes of the Omega's era didn't have enough ratios, and they have zero ability to read the road ahead, so are no use on twisty stretches of road.