Thinkpad P51s and ZenBook Pro share specifications such as Display Size (15.6 inch), Display Resolution (3840 x 2160), Form Factor (Clamshell), Operating System (Windows 10).
The main differences: Processor Model (Thinkpad P51s: Intel Core i7 7600U 2.8GHz, ZenBook Pro: Intel Core i7 6700HQ 2.6GHz); GPU Model (Thinkpad P51s: NVIDIA Quadro M520, ZenBook Pro: Intel HD Graphics 530); Installed Memory (Thinkpad P51s: 16 GB, ZenBook Pro: 12 GB); Storage Capacity (Thinkpad P51s: 1000 GB, ZenBook Pro: 128 GB).
Thinkpad P51s may suit users who need its differing values, while ZenBook Pro benefits those who need its paired strengths. Review the specs table above before deciding.