So I dont have a ton of money to spend on another Canon L lenss 
So im going to try out a 3rd party one. Ive heard good thing about the Tamron 17-50mm F/2.8 XR DI-II LD IF PO WTF
but I saw that they also have a 28-75mm F/2.8 XR DI II LD IF
My question is which one do people usually say is better? Would the DI-II be better for my Rebel XT? Im looking for a lens to basically replace my 18-55mm kit lens. I have the 70-200 F/4L so im covered on length..
Thanks

, 135mm f/2.0

