Best college for an undeclared Stem major?

Hi Im a high school senior and I am amidst college decision season but I am having a hard time deciding between various schools I have gotten accepted to. I am an undeclared but see myself in the stem field of things, I know that’s very vague and it embarks a great load of different majors but I am still figuring it out okay. The ones I’ve been in between are Cal Poly SLO, CSU Long Beach, Chapman University, UC Santa Barbara, UC San Diego, and UC Berkeley. ( still waitlisted for UCLA). I want people’s opinions on these schools and advice on which one would grant me better opportunities- thanks!