Like I said in your other post I would reccomend the Aquaclear. I have no personal experience with the penguin, and I never said the AC was better, but I have two aquaclears and they work very well, and are very reliable. They are also a little cheaper.
I have experience with both and love both!
What kind of cichlids are you getting? That may answer your Q. If you are getting cichlids that like calm water, you need a filter in which you can adjust the flow (AC).
Never used a penguin, but i LOVE my AC's (I own 4 of them, various sizes on various tanks). The fact that they use a media basket, so you can more easily customize your filter media is the strongest selling point for me, second only to reliability.
Former advisor and planted tank geek...life's moved on though.