Although this thread is old, the difference remains the same. Simply said, "The People" make the difference.
I found no evidence of Inworld residents openly dissing SL nor do I find the opposite SL residents dissing Open Sims. There are those who cut their teeth in SL and will not leave until the power goes off at Linden Labs, while others have the very same pioneer spirit to explore other worlds, that same spirit which created Second Life. There is good in both worlds, shortfalls as well.
I am a resident and creator in several worlds. Looking at the numbers only, growth is extraordinarily