The Wii is relatively low computational power: its selling point was the "physical interaction" (recently copied). The PS3 and the XBox 360 are high performance, but they're different chip architectures (Cell and PPC-variant respectively), so if you really care about writing the fastest code you can, you need to spend time investigating their quirks. (Also it's unclear if the cooling is up to running 24/7, like they would on a scientific project rather than gaming.)