I like the Vanguard...it's a great platform and I wouldn't own a Tikka.
I've owned both of these rounds for decades, and between the two, I'd go with the 300 Win.
Ballistically, they are very close, and it's easier to get good 300 Win brass, and 300 Win is just easier all-around.
But I prefer the 300 WSM
to either of those.
300 WSM will do everything the other two will, in a smaller, lighter package, and without a brake.