OP, you haven't listed many covid vaccines like Pfizer, Moderna, Johnson & Johnson and some less known vaccines. Without these, your poll results won't represent anything.
Personally, I think that most us can't say which one vaccine is the best. Most of us don't have medical education and now it's nothing more than popularity contest.
Sinovac vaccine has a single-dose efficiency of just 3%, according to a study performed by Universidad de Chile.
3%? Did I read it right? Shouldn't it something like 30%? I tried to look for more data about this vaccine and there is lot of different numbers. From what I found, efficiency of Sinovac vaccine is between 50% and 78% according to different researches.