Sump Pump Quality

I’ve been researching various manufacturers and models of sump pumps, as I am seeking the *quietest *model available. I already know that a submersible pump that is fully sealed with a good check valve helps minimize noise. Supposedly the two best for noise reduction are the Red Lion (very popular in Canada) and the Zoeller pump. I have not been able to determine what makes these two so special. One Red Lion pump owner claims that he can only hear water in the lines and nothing else.

Zoeller! By the way, nice chatting with you the other day. Keep me posted on the outcome.

I saw these at Berland tools the other day when I was looking at dewatering pumps.