Stuck between two laptops!! Help me!!

I would get the 15" based off the size because I use a laptop for portability and 17" is pretty big to carry around campus every day. If you think you want to watch/edit a lot of media or play games I think the 17" is better based off the graphics card but I don't really know that much about the technical specs of computers.
 
Those two computers are completely different.

The 17" is like a mid level computer (1600x900 17" screen? puke. gtx 630m bleh)

The 15" is higher end, nice graphics and screen but still only has a 5400rmp HDD

I'd say look for something with a decent graphics card (maybe inbetween what you're looking) and something with a SSD if you can.
 
if you want it for robotic engineering, look for a workstation graphics card. Robotics typically is a combination of mechanical and electrical engineering, and the workstation cards are very useful for parametric modeling and finite element analysis. Also, don't get a 17", 15" is already a pretty big laptop, and if you want the screen space, just get an external monitor.
 
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