Magnification ( was thinking 12x max)
Less important on a hunting scope than most people think. Animals are a lot larger than target dots on a page and the whole animal is a point of reference. A 12x maximum will take you out to a long ways in the field. I hunted with 4x, 6x, and 3-9x scopes for years and took shots well over 300 yards in that time. When I got my first 4-16x, I don't think I ever turned it up past 12x. I have an inexpensive Athlon Argos 2-12 that is about perfect from that perspective.
1" scope tubes will give you the lowest weight, under a pound is pretty acheivable. 30mm tubes are as large as I go with hunting scopes and will run a bit heavier, 20-24oz weight range depending on other features is not uncommon.
In general, I would prefer a lighter rifle with a bit more weight into the optic if the trade-off makes sense. A lot of European hunters like big objectives on short carbines, it suits their hunting style and preferences
Lots of people are saying Leupold in this thread, but they have an objectively poor track record in harsh testing conditions (check out Rokslide field evaluations). "Never had one fail" is anecdotal. Trijicon and Nightforce are most reliable in repeated drop testing. Bring your wallet.
Would you rather turn a dial or shoot off of a reticle with defined hold over points (like a BDC reticle). Those hold over points on a second focal plane scope will only be correct at one magnification, whereas a first focal plane scope it doesn't matter as the reticle scales with the magnification - downside being it gets pretty small at low mag.
I am much quicker off of the reticle, but much more accurate with an exposed elevation turret. I also prefer not having to take my eye off the target/animal, I range it, if I can hold dead on I just get on target and shoot. Otherwise I turn the mag up, pick the right holdover, and shoot. Either way, I can go from rangefinder to reticle without much interruption.
I like it. I'd rather rhave it and not need it than need it but not have it. Out in a stand or blind in the middle of the day it's not really needed. Near dusk it's pretty easy to lose a reticle on a black bear in the brush - but a little goes a long way!