The only thing that would be better than animal trials would be some sort of flawless digital recreation of a human being that scientists can infinitely experiment on.

Preferably a wide variety of human beings, white, black, Asian, native, male, female, young, old, with current diseases, without current diseases, etc., etc.

Until that technology exists, animal testing is the next best thing.

If you want to skip animal testing, then you're just going to start doing Joseph Mengele's experiments in the Nazi death camps again, and we've been there, and we learned a lot from it, but it was absolutely atrocious, and not worth what we got from it.

https://en.wikipedia.org/wiki/Nazi_human_experimentation