I would rather see the Patek ( most charming ) - Absolutely, but no date and timezone changes only uni-directional. Unitime bi-directional + date!
The JLC ( most innovative ) - Absolutely (if you mean the Geographic) but no date and poor legibility - If you like the fixed city ring, check out the IWC Pilot WT, same system, but with date and much better legibility.
the GP WWTC ( most reasonable ) - Pricewise not much different from the Unitime, nice for stay at home, but takes more changes when you actually travel
and the Vacheron ( most complete with 37 different time zones ) - Absolutely, but no date and not that easy to change the timezones, you have to find an exact 'click' to set it correctly. On a €30k watch? Come on!
I chose the Unitime over the Patek WT and WT chronograph, over the Vacheron and over the JLC, not because of price but of functionality.