Fluval Edge sponge filter is the best. I use them as a mechanical filter to catch fine particles. They also soak up a lot of the colour from driftwood.
They're all about the same... Bigger the sponge and tube, the more it'll filter. I made some DIY sponge filters and they work just as good as the name brand stuff. I would rate for up to 55g for each of them. It cost me about $5 compared to $10+
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