They serve different purposes, and have very different personalities, so it's really up to what you are looking for. Oto would would be an algae eater, and the cory is more of a scavenger of regular fish food.
Totally different. Get a bunch of Corys. Depending on tank size, like 10 or more. After the tank has been running for several months, assuming it is well planted, add a dozen Ottos. Something to concider...before introducing Ottos, let a nice amount of diatoms accumulate on the rear and side glass. They will chow it down while acclimating to your tank.
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