The immaturity is astounding, though sadly highly common in the gaming industry. This is their list, nothing should be chopped from their list because they came up with it. If you want to do your own list feel free but there's nothing wrong with theirs.
Definitely the original for me. Better music and better levels. The sequel was good fun but the galaxies had a quantity over quality feel to them, a few in particular felt very lazy and uninspired. Also storyline wise Galaxy 1 felt like a coherent adventure whereas the sequel seemed more like DLC.