Between the two, I would pick Cottage Living. Cottage Living is my favorite expansion pack for the Sims 4. I love the animals, the world of Henford-on-Bagley, the new harvestables, canning, the simple living lot challenge, cross-stitch, the errand system, etc.
I like Snowy Escape as well. But, I mainly use the world of Mt. Komorebi as a vacation destination. One draw back of Snowy Escape is that the winter sports skills are tied to Mt. Komorebi (with the exception of the Rock Climbing skill, if you have the rock climbing wall from the Fitness Stuff pack). The lifestyles system that comes with the pack can also be a bit annoying after a while, & I usually end up turning lifestyles off.