I could never see the touristic appeal of Gdynia, but it is (or at least used to be) the very best city in PL to live in. I wouldn’t trade growing up there for anything. Unfortunately life displaced me to my least favorite city :)
But as a Californian, the two cities feel as different as Arcata and Eureka.
Warsaw?
I personally enjoy each of the cities and the Kashubia and Kociewie surroundings, it’s just each of these places has its own soul and unique culture