It's difficult to have a favourite version of Seven, because it is often a matter of horses for courses rather than preferences. 68000 machines, with little RAM and no taste for 32-bit operation, have to stay at the bottom of the pond, even with a retro-fitted 7.1.3. A RAM-starved CC can run 7.6.1, but not with any speed. The Beige 60x towers can run 7.5.2 and up, with exceptions, but why? unless it is necessary for certain software. In a purely abstract sense, 7.6.1 is an elegant start to the line of OSes rather than Systems, but it's not for every Mac. 7.5.5 seems to be Apple's choice, in that they have made it into a virtual Reference Release (an Upgrade), rather than a mere Update, for the use of us antiquarians.
de