Optical Wattage of LASER needed for RAMAN spectroscopy

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I'm currently using this document to purchase the parts I need. Being no expert, and looking on the table of the 532nm laser diodes used, it doesn't seem to matter much what wattage the laser should be. Is there any advantages to using either a low wattage or high wattage laser, apart from the heat deposited in the appliance?
 
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