I only have experience with the kole tang. Mine grazes on the glass and rock all day and picks at any sort of algae or film on the glass. I'm very happy with him and keeping the tank pretty clean.
It depends on what kind of algae you want eaten. As Grok said, bristletooth tangs do very well on film algaes, but if you want something to graze on hair algae a yellow or scopas would be a good choice.
A Kole along with a One Spot Foxface is a algae killing machine! At least in my tank.
They seem to encourage each other to go after any green in the tank. The Kole likes flatter surfaces, the FF likes the tight spots. They seem to always be in a competition to see who can eat the most.
Think about the mouth structure, and the answer is somewhat self evident. Bristletooth tangs do better with flat surfaces and film algae; zebrasomas better with tight spots and hair algae. Individual behavior varies though. I have a yellow currently that is a GHA eating machine, but it's predecessor hardly touched the stuff
I would say yellow tang, all tangs graze all day. Koles don't get very big so they will graze less than a yellow. I have a orange shoulder that will decimate algae along with my Quoyi and fox face. Really boils down to type of algae you are having problems with as to which will work best
I've had them both, and at one point together. The kole I noticed is a constant grazer whether it be glass, rocks, and our kole likes to clean sand even as well.. The kole is just a more peaceful fish in my experience. Highly recommended!
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