Any of them would do OK, I would think. The ones that spray out a bit would probably aerate better. I've got a grecian fountain myself, but that spinning rainbow one has caught my eye.
Be forewarned - aerating using a fountain will cause your water temp to drop.
The Polaris Waterstars shown on your referenced website is a WF model (it attaches at the return fitting, and stays there). It does not extend to the middle of the pool, but it does just fine, depending on wind conditions. The other floating model shown works very well, and does not stay at the wall.
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