The primary advantage of larger pipe is less head loss and higher flow rates so turnovers will be faster and you can shorten the pump's run time saving $$.
In addition, because of the lower head loss, the pressure inside the pipes will be less with 2" than 1 1/2". In most cases, higher pressure is not a huge problem unless there is a weak joint somewhere.
Also, 2" is not that much more expensive than 1 1/2" so I would go with the 2".
Any reason other than cost that you did not want to go with 2" pipe?
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