Without understanding, opinions aren't very helpful and possibly annoying. More opining, less listening and less asking slows down the pace of learning and understanding. It may also leave a bad first impression with your teammates, break trust, and hurt future collaboration.
The strength of our opinions on a topic should correspond to our depth of understanding of a topic. When you are new, consciously listen, do your homework, ask and be curious. If you have ideas or opinions, offer them softly ("would it make sense to ..." etc.).
A good leader doesn't come into a new team or domain with guns blazing.