I am no expert in marine aquariums but I think I want to share some thoughts about an algae turf scrubber. I really do not know what defines a good algae turf scrubber (ATS) so if someone could reply me in this post, it will be good.
So the thoughts go like this. Suppose an ATS is supposed to help a reefer curb the growth of algae in the main tank by outcompeting, that means that we just require the algae to growth on the turf of the ATS. Meaning that, the "best" ATS will have the fastest growth of algae in the ATS, so that algae will not grow else where within the system. Hence, the determinant will really lie upon the growth of algae and the species of algae (for which, we do not have control of).
Algae requires two factors for growth, light, water and nutrients. Hence, the three things that will affect the effectiveness of the ATS would be: one, the type of light used; two, the flow of the water down the turf; and three, the amount of nutrients in the tank. Of course there are other factors to consider with regards to any product, the functionality and quality of the product but from what it seems from this post, it is a product of quality and at the same time very functional in terms of the fitting into the tank.
So my point is that, the type of algae that grows in the tank determines the effectiveness of the ATS. So if the design of the ATSs are largely the same, then this ATS would be of consideration as quality and functionality meets the requirement of Lenny.