Are either of these methods much better than the other in preventing algae or other problems?

My CYA is around 100. Up until now I am just using bleach in the skimmer every 3-4 days to keep FC around 6-10ppm

But just curious if running a lower chlorine (3ppm or so) and adding polyquat every week would be just as good?

Also,even if I just run higher chlorine would it be good to supplement with polyquat as an extra preventative or would that just be a waste of money?