I've updated the pollster leanings chart with Strategic Counsel. I've also removed the Ontario part of this chart, as it was usually similar to the national leanings. I've kept Quebec because of the presence of the Bloc Quebecois and how that changes things.
Strategic Counsel is the most favourable pollster to the New Democrats and the Greens, nationally, and to the Greens in Quebec.
This chart tracks how each pollster tends to lean when calculating support levels for the various parties, as compared to the average polling results from other pollsters each month. This does not necessarily equate to a deliberate bias, but instead is more reflective of the polling methods used.
As you can see, the list is not complete yet.
The following chart shows each pollster's average variation from other polling firms. The numbers are the amount of percentage points a particular pollster favours or disfavours that particular party compared to other pollsters over a similar period of time.