Both of my most recent bows I bought sight unseen. So I would have to offer that my decision was originally based on reputation and past experience. I have never had a major issue with any of the Bowtech bows I purchase and when I did have questions their technical support and customer service was top notch.
As for the bows in particular...... I wanted a bow with specs specifically geared towards 3D shooting so I opted for the Old Glory. Its length, brace height and speed ratings are what initially caught my eye. My hunting bow, a Diamond Triumph, also appealed to me as its axle to axle length, brace height and speed were exactly what I wanted for a hunting bow. The price wasn't too shabby either.