It's not really a "preference" thing. Statistics is actually a prerequisite course at some of the vet schools (I know UC Davis is one, offhand), and calculus II is a prerequisite course at no vet schools. If you want to take calc II for the fun of it, go for it (I took it because I was a CS major), but be aware that you may have to take Stats in addition to it if you are applying to any schools that have it as a prereq.