904 vs 999

I'm no transmission expert.... with that said, this is what I "think" I know....

• the A999 is like a 904 but has a lockup TC, usually a lower 1st gear ratio, more clutches and stronger bands.
• However, the 904 usually has a "higher stall" in the converter from the factory.

I have found that even though the 999 has a lower 1st gear ratio, the 904 "feels" quicker because it seems to flash the converter a few more hundred RPM's taking off.
Am I correct?
Thanks in advance for knowledgeable responses.