I would go with the Leica. I did a tons of research the last few years and purchased a new rangefinder last year. I went with the zeiss 8 by 26 prf. It is ok, but if I had to do it again I would go with the Leica.
Personally, I would take the Leupold over the Vortex and the Sig and Leica over the Leupold. For bowhunting don't get the Lecia 1600-b it doesn't compensate angle under 100 yards, unless they've changed it lately.