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Doesnt matter. Both will work. One is the slim 7mm and one is the 9.5 or 9mm
Both will fit with no issues too.
 
So Im planning to get the Samsung 830 512GB SSD for my 15-inch MBP.
I went to Newegg.com to purchase a copy but found that there were two...
Which one am I supposed to use?

http://www.newegg.com/Product/Product.aspx?Item=N82E16820147139

or

http://www.newegg.com/Product/Product.aspx?Item=N82E16820147165

Thanks in advanced!

Either one is fine. With the upgrade kit you get a nice adapter though to use your drive externally. Only difference. Well in this case, it'd be for your old HDD. Oh! And the upgrade kit brings a bracket so you can put your old HDD into a desktop if you want.
 
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