I have both a Stiller Predator and 3 Borden Alpines. I think the Alpines are finished nicer,and they appear to be tighter and I don't care for the hard anodize Stiller uses. I like the larger scope base screws on the Alpine. The Alpine looks better to my eyes i suppose, with the flat side and standard size port opening.
Outside of that personally opinion prevails.

I don't think you can go wrong selecting either.

Michael

My biggest fear is when I die my wife sells all my gear for what I said I paid for it.