Which build is better?

Neither is very good.
PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-7500 3.4GHz Quad-Core Processor ($189.75 @ OutletPC)
Motherboard: Gigabyte GA-B250M-DS3H Micro ATX LGA1151 Motherboard ($68.89 @ OutletPC)
Memory: G.Skill Ripjaws V Series 16GB (2 x 8GB) DDR4-2666 Memory ($99.97 @ Jet)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.33 @ OutletPC)
Video Card: EVGA GeForce GTX 1070 8GB SC GAMING ACX 3.0 Black Edition Video Card ($374.00 @ Amazon)
Case: NZXT S340 (Black/Red) ATX Mid Tower Case ($66.99 @ SuperBiiz)
Power Supply: SeaSonic S12II 620W 80+ Bronze Certified ATX Power Supply ($49.90 @ Amazon)
Total: $898.83
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-03-26 21:03 EDT-0400
 
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