I'll comment on which scope is better.  I have many Nikon Monarch and pre-monarch scopes and they have NEVER failed me.  They are bright, clear, sharp, and track very well.  I once had my Nikon 3.5x-10x-50mm mounted on my Browning A-Bolt Stainless Stalker in .270 Winchester.  I was walking down a steep slope and the rifle fell out of my hands.  The gun (with scope) slided down about 10 feet or so, going over rocks, etc.  I though the scope would be damaged, but it wasn't.  In fact, I took it back to camp and shot it.  Guess what?  It held it's zero!  Wow, boy was I surprised.  So do I recommend them?  Yes.  I own about 7 of them and couldn't be happier.
As for the Weaver GS, I have only used them at the range and their optics seem good, and their tracking is excellent.  No long term use, nor do I own one, but from my limited experience, the GS scopes are very good.  The one thing I don't like about them is that they have a very short eye relief.  I know that you are concerned with FOV, but I'm more concerned with eye relief, especially on harder kicking rifles.
I don't think you can go wrong with either one, but from personal experience, I would recommend the Nikon Monarch.
Zachary