I don't know the light transmission for any of the Simmons scopes, but I DO know that I have seen quite a few scopes literally fall apart. I know that there are people out there that have many Simmons scopes and swear by them, but I wouldn't take a Simmons scope for free.
The reason I say this is because I don't want you to think that light transmission is everything - because it's not.
It's like buying a car...you don't just look at the engine to see how much horsepower it has, you have to look at it's quality, reliability, etc. You also have to look at the transmission, brakes, suspension, handling, etc.
As for light transmission, I can tell the difference between 88% and 95%, but I don't know if I can tell the difference between 88% and 91%. But trust me, the better the light transmission, the better you are, even if shooting during legal shooting because there is just nothing wrong with having very good glass.
Zachary