Both have their pros and cons. I like the Aquaclear because of the amount of media it can hold and the 500 gph turnover. I don't like how they cause very little surface agitation due to the waterfall effect. I like the Emperor for the ease of changing filter pads, it's slightly cheaper (less gph) but I mostly love the amount of surface agitation it produces. I've personally had bad luck with aquaclears so I vote Emperor.
There was a thread yesterday about best hob filter. The top 2 are the ac110 and the emperor 400. Big debate on that. Personally I voted for emperor 400. I have 4 of them and 1 of the smaller version 280.
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I have 2 ac 110s on my 180 and they provide plenty of surface agitation....I've had both filters I always felt like the emperors felt cheap and flimsy compared to the 110...plus the extra 100 gph on the 110 is nice