How Do Pro a Poles Compare to National Polls?

In small provinces it's much harder to reach enough people, or at least a representative sample of the people. So we only had three polling firms on field in this election and all of them published small sample sized pols. And so it's, it's apples and oranges compared to a federal election, or to a quebec or ontario election where we have at least ten posters and a polling regularly every week. But for example, just six months ago, when even ranking the outgoing premier of nova scotia, reins of the liberal party there, he was leading by over 20 points over the p seton - that lead melted to about ten points.