$2,000 Custom PC vs $4,000 Mac Pro

My PC Build: Intel i7-5820K CPU - Corsair H115i CPU Cooler - ASRock X99e-ITX Motherboard - Corsair Vengeance 32GB (2x16GB) DDR4 RAM - Crucial MX200 500GB SSD - Samsung 950 Pro M.2 NVMe SSD - EVGA GTX 980 Ti Hybrid Graphics Card - EVGA P2 750W Power Supply - Fractal Design Nano S mini-ITX Case - Also, I