ZenBook Pro and Precision 3520 share specifications such as Display Size (15.6 inch), Launch Year (2016 year), Form Factor (Clamshell), Operating System (Windows 10).
The main differences: Processor Model (ZenBook Pro: Intel Core i7 6700HQ 2.6GHz, Precision 3520: Intel Core i7-6820HQ); GPU Model (ZenBook Pro: Intel HD Graphics 530, Precision 3520: NVIDIA Quadro M620); Installed Memory (ZenBook Pro: 12 GB, Precision 3520: 16 GB); Storage Capacity (ZenBook Pro: 128 GB, Precision 3520: 256 GB).
ZenBook Pro 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.