Hmmmm… Very hard to decide? I mean there are so many cool citys! Blackwater has its cool under attack 24/7 type thing going on, Silver City has really cool music and areas (like the Gravity Boots, and cool fighting areas!) Then there is Metropolis… Can we include Thug HQ? If so I'd say
1. Metropolis
2. Blackwater City
3. Thug HQ
4. Silver City
5. Kerchu City
(I haven't put all that much effort into the list, and there may be others I forgot…
TOD's Metropolis and Lombax Ruins on Fastoon. Meridian City and Luminopolis were cool too.
Blackwater city is also cool, I like the dark blue colours.
kerchu city was my favorite
kerchu city was my favorite
I cant choose one so ill do a list, here they are in order starting with my favourite
1. Metropolis (ToD)
2. Meridian City
3. Axiom City
4. Stratus Ciy
5. Kerchu City
6. Luminopolis
My favorite city has changed over time in the series,currently it's Axiom City,I love the graphics and i think it looks…well Beautiful 
