Pros:

Replayability
Good Graphics
Good AI traffic
Mods and assets on Steam workshop
Achievments
Steam Trading Cards

Cons:

Too many citizens become sick
When you get to over 20,000 people nobody wants to move in
Everybody dies because of noise pollution
Sometimes hospitals and fire stations don't work

Pros:

Great Graphics
Nice scenery
Nice trucks
Detailed interiors
Variety of jobs and trailers
Mods from Steam Workshop
Trading Cards
Achievments

Cons:

Would like a bigger map ( I know there are more states coming like Arizona )
More types of AI cars