Just got my first Sam Hober yesterday in purple grenadine grossa with contrasting bar tack, and I absolutely love it.
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1. No of the weaves are "better" than the other. They are simply of different aesthetics. The grossa is of a bigger weave and the fina of a smaller weave. I have both, and I find both to be truly amazing ties.
2. I can't speak of the midnight blue, but I do own the grossa dark navy and fina navy, and the dark navy is a really dark, rich blue which is slightly more muted in the color and richness than the navy. I really, really the grossa dark navy and strongly recommend it!
Give David an e-mail as well, as he is really helpful and knowledgable.