When the vaccines first came out both my wife and I decided that we would wait a year or so to see what a longer period of time would show us. I was adamantly opposed to the Chinese vaccine based on the complete lack of responsibility from the Chinese government owning their part in all this.
After reviewing all the information (good, bad, true, fake or whatever) we decided that not even the Chinese would attempt mass harm to their own people( not counting the genocide on the Muslim areas). Also several other countries using Sinovac have shown excellent results. Taking everything into consideration we went for the vaccine on Tuesday. It was the most organised thing I have ever seen in the Dominican.
One of the main deciding factors was travel. If an airline or cruise ship company says no admittance without a a vaccine then your kind of stuck. We travel a lot and are not willing to give that up.
I hope the second shot goes as well as the first. Whatever you decide I hope it works out for you. As after all, it is your decision.