Hello if we are talking about optimizing sets then I believe that tailwind should be far more common on the pokemon that get it, I just loaded a game with Shaymin that had no Tailwind and instead had Protect, Seed Flare, Earth Power, and Synthesis. Meanwhile my opponent had tailwind up and if I had a chance to match their tailwind I actually could’ve caught back up, but instead I just lost speed control the rest of the match and slowly lost the game
I think any good player will say that consistent value like tailwind is basically always better than things like Protect which relies on you predicting your opponent/getting lucky. Protect is also basically useless on Shaymin normal, its special attack is so low anyways and it’s hard to oneshot so its never a priority target.