I like the first build. If i have to choose between those two, definitely the first one.
Do you have a site from which you will buy? If so, provide the link.
Good build nonetheless. Although i prefer gigabyte motherboards over others, as i did not have even one issue with them. The second build on PCpartpicker has a sub par power supply, not that good.
Another suggestion if you will not overclock -
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel Core i7-6700 3.4GHz Quad-Core Processor ($433.00 @ Centre Com)
Motherboard: Gigabyte GA-H170-D3H ATX LGA1151 Motherboard ($159.00 @ CPL Online)
Memory: G.Skill Ripjaws 4 series 16GB (2 x 8GB) DDR4-2400 Memory ($91.30 @ Newegg Australia)
Power Supply: XFX TS 650W 80+ Gold Certified ATX Power Supply ($119.00 @ PCCaseGear)
Total: $802.30
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-06-02 20:40 AEST+1000
If the price is bit high for you, i suggest get this motherboard -
http://au.pcpartpicker.com/product/k27CmG/gigabyte-motherboard-gab150md3h . If you want to spend $850, get this motherboard, get 8GB ram -
http://au.pcpartpicker.com/product/sMbkcf/corsair-memory-cmk8gx4m1a2400c16 and get an SSD -
http://au.pcpartpicker.com/product/3kL7YJ/samsung-internal-hard-drive-mz75e250bam