Back when I was researching pumps, Advantage had a very poorly laid-out website, providing either no flow/head data, or made it hard to find. Either was a red flag to me. Maybe they're better now, but there's only so much that can done with a centrifugal impeller type design for very low head installations. The "best" pump very much depends upon the flow and head, where what's most efficient for one situation may not be for another. The FlowFriend Pro for example, would be a poor choice with any more than about 24" head. My situation was unusual in that it was too high for an airlift solution, and too low for a centrifugal impeller pump to win out. Again, it paid for itself in my application, but every situation is different.