I don't trust any of them, and I don't need any of them. Don't misquote me.
I'm not sure how you justify the rapid change of direction. While Trump was in office, the MSM and their mindless sycophantic followers screamed from the rooftops that Trump was rushing the vaccine, and that there was no way they'd take it because it didn't go through the normal testing process. The nanosecond Biden takes office, suddenly the vaccine is perfectly safe and BTW - it's Joe who gets the credit for that.
HILARIOUS!
That there were 3 that didn't pass initial testing doesn't surprise me in the slightest. I'm sure a lot of animals are killed when experimental drugs and vaccines are first tested. Theoretical drugs often have theoretical benefits - it's when the theory is put into practice that the true benefits (or costs) are determined.
Personally, I'm against many vaccines. The influenza vaccine, for example, weakens our immune systems. In my social circles, I have friends who have never had one, friends who had them and stopped taking them at some point (myself included), and friends who still take them. It's very curious that those who have never had one - they never catch the flu. Those of us who stopped taking them at some point - depending on the length of time since our last flu shot, we have lower rates the longer we have gone without it. Those who take the flu shot, they catch it almost every year.
Certain vaccines, it makes sense. Polio, MMR, Tetanus, Hep A&B - sure. Those vaccines have a long track record of success with side effects being rare.