Curious. Here's a binotatus(Fishes of Australia), note the blue eye ring and spots on the base of the tail(technically the back of the dorsal and anal fins).No, I specifically ordered a bristletooth from my LFS. I needed algae control.
Here's a smaller striatus(Fishes of Australia), note the different eyes and the lack of any spotting on the tail.
big striatus:
Depending on the size of your tank it may not matter, they both function the exact same when at similar sizes.