Green Cab is by far the best cab company in Madison. I do not take a cab very often, but from now on, when I do... it'll be Green Cab.
1 - I scheduled a cab via the Internet because I prefer not waiting on hold or chatting with someone that may lose my reservation. Not only did it show, it came 10 minutes early.
2 - The cab driver's prior customer vomited in his cab. Rather than put a towel over it, spray axe or new car smell and crack the windows open, he picked up a new cab.
3 - They have frickin' iPads for GPS navigation - I saw that and thought that I went to cab geek nirvana.
4 - They charged flat rate to the airport. He only charged me $14.00! I was stuck with Madison Cab on the way back and the same trip cost $30+.
5 - The driver I had was very sane -- nothing seemed off -- it really felt like the Twilight Zone.
In comparison -- Badger takes and picks up other folks in the cab with you. You get to hang with folks that are contracted services via government - sketchy is an understatement. One time is all it took for me to never consider this company again.
Madison and Union Cab gouge you until you can no longer leak. They do not pick up their phone and are very undependable. Madison Cab drivers all seem really off.