There's a big difference between saying "Out of those labs listed, Syn would be my recommendation" vs "Syn is the best lab, by a landslide". One is a targeted response to OP's question, the other is a VERY bold statement that somebody with your status here likely shouldn't be making. As you said, we know nothing about you or your communication with these labs, which is exactly why I said you don't have the qualifications to be making such a claim.
My goal here isn't to start any sort of keyboard war. But more-so a notice to you and others reading this to choose your words wisely, especially in a thread such as this.
My own opinion, out of those labs listed I would likely say Syn as well. But there is a pretty long list of labs I would recommend before them, but I won't because this is not the place to do so.
