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Maroun,
The two most important aspects of biological filtration are surface area and sufficient flow. This holds for undergravel filters, wet/dry systems, live rock and even deep sand beds.
The design of a bioball is to provide a large surface area in a small volume. According to Moe (1992), a single bioball has a surface area of 400 cm2. My filter has 82 in it, so that's a surface area of over 3 m2. That's not going to be enough to run a large tank with a lot of fish, but should be fine for 2 or 3 fish.
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ATJ
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