I actually like aquaclear... I know that doesn't hep bu I liked being able to arrange my one media in the filter chamber.
If not aquaclear,, I'd go with the one has the motor integrated with the filter housing. The motor is not detachable. I've seen the o-rings go bad and also seen the motor fall of during use on filters with removable motors. I think it is the penguin that is the sealed unit with the motor. This was a all a long time ago. I switched to a cannister filter and never looked back.