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I like the outrigger sponsons. They provide both lateral and longitudinal water stability. Almost like a tricycle gear seaplane. Much better than the typical Lake/Goose configuration with wing tip floats, I think.
With my amphibian LSA project, I have been kicking around the idea of "removable" sponsons/floats and possibly a detachable lower hull (or at least the minimal drag and weight profile I can pull off and still operate safely). The advantage would be that you would not be hauling around the extra weight when you aren't looking to do water based operations. Basically one could relatively quickly transition between the two if you have a desire to go somewhere water based operations are feasible/desirable. If I were going to the Bahamas or Florida, a flying boat would be a great option. In the Midwest, not so much.