Textured strings are interesting. Even the shaped and twisted ones like Tornado and BHBR all suffer from the same downfall that geared strings like Blue Gear and Spiky Shark do. After even an hour of solid hitting, the sweetspot strings are now smooth. As TW postulated, therefore, it stands to reason that a textured main with a smooth cross would be best. And yet, I haven't found this to be the case. From poly to poly, there are differences. Silverstring, as an example, notoriously does not produce a lot of spin. As commish00 said, BAM does produce a lot. How much quantifiably? No idea at all, but the difference is noticeable while playing. The key here is that a smooth string like Scorpion or SPPP will continue to be spinny long after BHBR or Tour Bite have worn down.
So I'll summarize like this: if you're a huge hitter and break strings quickly, go textured for extra bite. If you're in it for the longer run and cut strings out, you might as well go with a smooth string. Just my opinion having just settled on a setup.