The two seem very similar, if not identical, in terms of hardware specs. Both 2x10GE, 8x1GE, managed, igmp v3, vlan, LAG, etc.
The Nighthawk seems to be technically designed for gaming, is in my opinion visually a disaster, apparently has a bit of gaming klicki bunti management software, possibly a bit more traffic prioritisation options and RGB LEDs. Whether it's really useful or worth the money is a question mark.
I would probably save the 120.- and go with the GS110EMX-100PES - I see little real additional benefit with the Nighthawk. The GS110EMX-100PES can also be installed in a rack.