My understanding is that the internals (optical and mechanical) are the same (which is a very good thing) though glass may have slightly upgraded coatings. It has locking exposed windage rather than capped (a downgrade for my use). I wouldn't hesitate if you prefer new and/or don't want to wait for a good used one to pop up in classifieds.
If you're looking to spend new lrhs2 money, the often out of stock Maven rs1.2 and the trijicon Tenmile (often on steep discount sale price) are both great options for similar dollars.
If the SWFA 3-9 ever comes back in stock that's probably the best scope for your described uses. Don't hold your breath though. No one who's got one wants to sell it right now, even though they could get way more than they paid for it new.
