We are trying to decide which shape to get. We are debating between a 22x36 Mountain Pond or a 18x36 Rectangle. The PB said the Mt pond will be a bit smaller than the rectangle as far as gallons. We are torn and love them both. Price is basically the same either way. Anyone with this size? Which do you have? Which do you prefer? We will be using it mostly for lounging around and parties my husband might swim laps but the rest of us will use it for play. Picture are alway appreciated. Thanks.