mon,
Neither of those is a preferred mode of getting to KM. It would take you at least 15-20 minutes' walk. However, if you really have to choose between the two, I would go for option a) to prevent walking along busy streets and smelling polluted air. It should be a much more pleasant walk from Kowloon Tong MTR station. How about taking a bus? Where is your starting point?
Danielboy and Ianmami,
This morning, when I saw KM bus, I just imagine when Moses started KM for the 1st three days, we can accompany with him for class. Then I planned to let my maid follow him in the school bus, and I go there by MTR, previously I went to Fanny's Pg( near KM) by MTR, and got taxi from Kln Tong MTR because I carried Moses. But I think it is not a good way.
My starting point is Tseung Kwan O..
also, I also have to plan what is the best way to go to KM on Sat if Moses joins the choir.