Six of one, half-dozen of the other. Don't know about NBA2K16. However, for GTA V, you may want to consider that in GTA V the Core i3 chips take a noticeable performance hit compared to the Core i5 chips (http://www.techspot.com/review/991-gta-5-pc-benchmarks/page6.html)...enough of a hit that you'd most likely get similar performance out of them.
Personally, I would pick the i5/1050Ti build.