in my experience over the last 35 years deer hunting,I would rather have the 2.5-8 as any 4-14 made for deer hunting,,the only gun owned till I was near 30 years old was a Rem 700 25-06 with a straight 6X Redfield scope,I have probably killed at least 15 deer in excess of 400 yards and I never understood what makes people think a bigger scope will help them make a shot at short to medium range,inside 400,that they couldnt make with 9X on the high side.
heck Daddy bought a Win Model 70 300 Win Mag in 1965 and it still has the straight 4x Redfield scope on it,,
if I was in the market for a scope to deer hunt with I would get the scope you have or the 3-9 Ziess Conquest,,if you cant make a 300 yard shot on deer with 8-9X,you need to save the money you are planning on spending on a scope and buy ammo and PRACTICE..
some time some where a 14X scope with an AO will cost you a deer up close in the woods,
heck I do have a couple 4.5-14`s and a 3-15 Weaver Tactical on different Tactical type rifles and I can bang the steel at 1,000 1,200 and even 1,500 yards with those 14 and 15 power scopes,,