16x24 is my opinion, the bigger a pool, the more versatile.
I would guess that a 16x24 confortably will hold 10 - 16 people for waterpolo, if you want to swim laps, I would recommend only a few kids or it will make your lap difficult.
I can't comment on Artesina, but have heard a lot of good about them over the years on this forum.
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