It actually does not really matter where you are staying. Most time is used waiting for the bus, riding it from point a to point b takes 5 - 15 minutes pretty much from anywhere with the World.
I find the UG way overestimates both drive times and bus times. They also say though that they are essentially the same once in either vehicle. Its just how lucky or unluck you are in waiting for the bus. They are supposed to come about every 20 minutes, sometimes they are much quicker, sometimes they can mess up and be longer. I've had that happen once.
As for taking the monorail to epcot, I always found that longer from any MK hotel except maybe CR, though it is fun to do via boat and then transfer from WL. Makes it more interesting.
I've stayed at the WL before, furthest points from it are AK and DTD. For ecpot and DHSit will be about 15 - 30 minutes including bus wait time approximately. about 20 - 35 minutes to AK and the DTD buses seem to come less often at all resorts I've stayed, so that can be longer. Those are my best guess averages for when I was at WL.
I usually have a car rented for some portion of the trip to go to the west coast so I've used that too. Its faster but its just the no waiting for a bus thing that makes it so. I've read on these boards sometimes that it takes 45 - 60 minutes to get somewhere via bus in disney, which is just crazy. Its not a city transit bus with a bunch of stops, and WDW is actually not that big, 47 sq/m with most of it not accessible by car. You don't travel that far by bus/car and the increase in distance from the closest park to you, to the furthest, simply is not that much.