Which laptop is superior of these two?

I don't mind that one is refurbished. I don't know which will perform better in different areas. There's only a $10 difference so price variance isn't an issue.

http://www.staples.com/Refurbished-Dell-15-5555-15-6-LED-AMD-A6-7310-1TB-4GB-Microsoft-Windows-8-1-Laptop-White/product_2072043?externalize=certona##specificationsContent

http://www.staples.com/Lenovo-Ideapad-300-15-6-4-GB-RAM-500-GB-Hard-Drive-Intel-Core-i3-6100U-Processor-Windows-10-Laptop/product_2126772?PID=404255&storeId=10001&AID=10422268&SID=489559_desktop&cm_mmc=CJ-_-404255-_-404255-_-10422268&CID=AFF%3A404255%3A404255%3A10422268&CJPIXEL=CJPIXEL

It depends on what you are actually looking for. The Lenovo would all around be better as the processor is much faster. The RAM is identical. The Lenovo only has 500GB but that's always replaceable at a cheap cost. The Webcam for the Lenovo is also much better and is preinstalled with Windows 10.
So without a doubt i'd choose the lenovo

In short - the first one. If you don't mind it being refurbished, it'd be much more powerful, seeing as how the latter is only a dual-core, and the AMD laptop being a quad-core. You'd be better off with the amd, if what you're looking for is performance. Dunno why Sam would go with the Lenovo, but to each their own, and good luck!