I'm partial towards Monorail Blue because it was the first of the new series of monorails (the 'stand-up' series). They introduced Monorail Blue when they still had the old style monorail trains.
While down there in October, I went on a picture taking expedition my last day. I was leaving the Floridian and waiting on a monorail. I walked to the end of the platform and waited for 15 minutes for the next monorail to come by so I could take a pic of it coming into the station.
When I finally saw one coming down the track (you can see waaaayyy down the track to the left), I set up and waited for the shot, and it turned out to be monorail black. I was happy.
This December it seemed that monorail blue was following us. We took it one night from the TTC to Epcot. Then the next day in Epcot every time I looked at the tracks Monorail Blue came whooshing by. It was scary after a while!