which filter is better for a 30g

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Personally I'd go with the Penguin 200 or even the 350. It depends on how heavily stocked your tank is going to be. It is always better to have too much filtration than too little. The BIO-Wheel increases the oxygen contact for aerobic bacteria that contributes to the nitrogen cycle. The only reason I can think of not to use one of these is if you are going to have plants and inject CO2. Then the BIO-Wheel is a liability instead of an asset. In that case I would recommend this:

Aquarium Power Filters: Aqua Clear Aquarium Power Filters at PETCO

The AquaClear filters are very reliable and offer great flexibility in filter media. I use several in planted tanks and I don't even use carbon as filter media.
 
good idea on the aquaclear. for a 30 gallon tank i would get the ac50 or ac70.
 
I know I'm the minority here but I have been using Marineland filters for years with no trouble including a pair of emperor 280's that have been running with the original impellers for 8 years.
 
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