Titleist.
More specifically the Titelist Pro V1x. Whilst Titelist balls are used by 64% of the market, The Pro V1x accounts for 54% of balls used by PGA professionals. As seen at Gearosaurus.com
http://www.gearosaurus.com/?7?7?0
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Titleist, Srixon, Callaway, Nike and Taylormade are the most expensive. Their top ball range costs around £35 a dozen.
I think the most expensive and best brand for a golf ball is titleist. It is sold about €35 every dozen