Zombie thread!
Bringing back the dead accepted and I'll add this little bit. I own a 1982 6" 586 no dash and a 1975 6" Python. I've shot these two guns side by side, rested off the bench at 25 yards for accuracy. Both are excellent shooters. However, the Python always wins, but not by a great deal.
OTOH: I have a 1953 6 1/2" pre-27 that'll out shoot 'em both.
With the current prices on Pythons, I just don't see where this is a legitimate question any more.