I am a co-founder (and CTO) of a small company myself and hence get to talk to the folks in my company quite regularly. I disagree with the notion that passion or personal preference doesn't belong in a decision-making process. Not only does it belong there, it is even a critical part of it, assuming of course that you have good arguments to make for your point and convey it in a respectful and professional manner.
Having passion and personal preference displays that you are engaged in your job and identify with the work that you do and aren't afraid to speak your mind, which requires a certain level of trust. Even more, you were hired precisely because the company came to the conclusion that it can benefit from your (uncensored) input.
It sure depends on the context but presenting your thoughts as "one option is to...", is a marker that you are indifferent to the outcome. It generally does not display trust, confidence or engagement.
So, if your manager is worth her/his money he/she can handle strong opinions just fine and will also consider other viewpoints than yours in the decision making process.
W.r.t. "talk like a leader, not like an engineer", king_panic has the best answer IMO.