I'm getting into police style marksmanship competition (tactical shooting usually within 300 yards, moving targets, partially concealed, a little faster paced) and I'm trying to decide which scope I should get. I will use the rifle for hunting and long range targets as well so I want the scope to do it all. I have about $1500 to spend and I'm trying to get the most durable optic. Is the 5-20 any more durable than the 3-15? Should I consider the vortex 4-16 as well? Which is the toughest? Which would you choose?