Envy 13-AB002nv and Precision 3520 share specifications such as Display Resolution (1920 x 1080), Form Factor (Clamshell), Operating System (Windows 10), Operating System Architecture (64-bit).
The main differences: Processor Model (Envy 13-AB002nv: Intel Core i7-7500U, Precision 3520: Intel Core i7-6820HQ); GPU Model (Envy 13-AB002nv: Intel HD Graphics 620, Precision 3520: NVIDIA Quadro M620); Installed Memory (Envy 13-AB002nv: 8 GB, Precision 3520: 16 GB); Storage Capacity (Envy 13-AB002nv: 512 GB, Precision 3520: 256 GB).
Envy 13-AB002nv may suit users who need its differing values, while Precision 3520 benefits those who need its paired strengths. Review the specs table above before deciding.