Personally, I prefer 'Ranked Ballot' as:

a) I like the idea of being able to say, 'If this donkey doesn't win, my second choice would be this other donkey'. Why, in 2016, should I be forced to vote "all or nothing" when I vote?

b) It is a change that is pretty easy to explain and understand and would not force us to alter anything else in our system. 

c) LIke it or not, people in this country like the idea of having "their" MP in Ottawa whom they can vote out if she or he turns out to be a dud. 

d) If parties have to compete to be '2nd choice' for voters, that will naturally temper some of the partisan nastiness we see on display rather too often.