For all intents and purposes, both the Monorail and the Ferryboat take approximatly the same amount of time, give or take. There will be situations where the Ferry is quicker, and then there will be situations when the Monorail is quicker. It's hit or miss, and the difference is only about 60 seconds either way (which in the grand scheme of things makes NO difference). So, what I always recommend is taking the Monorail TO the MK, and then take the Ferryboat back to the TTC. It's really nice at night, especially in the summer.