hehe let me try
Processor: OPT uses 810, beats 801 on Zuk1. Apparently overheating is no longer an issue with Oxygen OS
battery: Zuk Z1 wins hands down with 4100mah
Memory: both have no removable storage and come in max 64G variants . Draw
OS: Zuk Z1 wins with Cyanogen Mod 12 vs Oxygen OS. This is subjective but i am assuming cyanogen has more experience and hence makes a better product with support. At least till they split again
RAM: OPT wins with 4Gb compared to 3Gb on Zuk Z1
Display : Both 5.5 inch full HD display. Draw
Front cam: Zuk Z1 wins with 8Mp shooter over 5Mp on OPT
Back cam: Both is 13mp but i think reviews show OPT cam and software is quite good so OPT wins
Price: Zuk wins hands down with its REAL flagship killer killer price
Accessibility: OPT need to ***** yourself to get invite while zuk no need. for this, Oneplus should burn in hell
Add up points (Assuming one point for each, draw is no points)
OPT: 3 points
Zuk Z1: 5 points
You have a clear winner

Disclaimer: i realize many people got different critirea, i merely tried to list what is impt to me and also what i think most pple talk about on this forums. Feel free to disagree and post your own views