Kinda of a comparison of complete opposites, but both fun games. Well BSD is fun if you like getting kicked in the balls over and over again.
Both have solid themes. WCS is family friendly, easy shooting game. Rules are pretty obvious. Colors are bright and the dog is pretty cool.
BSD is dark and gameplay is fast and brutal. Rules are somewhat shallow, but stacking multi balls feels so good. Ripping a great ball feels so rewarding. Call outs might be some of the best in pinball.
I tend to gravitate towards challenging games with shorter ball times.
My pick would be BSD.