If you can manage a good score without it, then preference should be to avoid spouse ECA. You'll need spouse ECA in two cases. If you want;
(1) to increase your FSW or EE CRS score
(2) spouse to work in Canada
Since its just 10 points from a total of 1200 for spouse ECA, its usually not worth the money, i.e., unless point #2 in the above is your target.