I own both and now Im trying to sell my fluval edge 6gallon now. Its got cute factors which is why my wife likes it but for the price I should have purchased the Mr. Aqua 12Gallon long. This thing is constantly on back order.
The edge is impossible to clean or catch anything moving. And although you are suppose to fill to the top I find it better for the shrimp to leave an inch of air space which defeats the whole purpose of the tank.
I dont hate it but I do find maintenance to be a pain.