The both finishes are good if they are done well. Poly tends to be much more durable, easier to clean, stains less, is more water proof and sweat proof, and looks like Nitro when done right. Nitro is beautiful but less durable in the sense it stains much easier with sweat...or beer. Satin poly is probably the most durable but does not have a shine finish like regular poly or nitro. Most necks today, including Martin and Taylor use a fine poly durable finish that aids in reducing neck stickiness, where as Nitro like on most Gibsons gets sticky when it absorbs sweat and can fog up the finish. Poly is virtually sweat proof and remains much less sticky on the neck when used hard. I prefer Poly over the Nitro or lacquer finishes for this reason.
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