Re: Bushnell 4200 VS. Nikon Monarch
If you search for "Bushnell 4200" or "6-24x50" you will see lots of good feedback on that scope. The Tactical version of the Elite 4200 is the one most recommended in that model so I assume you are comparing the tactical version of both scopes.
One big difference is that while the Elite does not have a lot of adjustability the Monarch has less (50moa vs 30moa). The Monarch is also a 1/8th moa adjustment versus 1/4th moa. You didn't say what you were planning to do with the scope and "better" is subjective. Those two things, however, would push me towards the Elite for a tactical rifle scope. 1/8moa might work better for a benchrest rifle but 30moa won't get you far.