There is plenty of info here and elsewhere on leupold scopes losing zero. Personally, I have only experienced it in VX-series scopes, but so far I'm 2 for 2 at them consistently failing to hold zero with relatively light use. No more chasing a zero for me, I moved on. I have friends with Mk5hd scopes that love them for PRS and have found them reliable, but those rifles are babied compared to my hunting rifle, so I have no first-hand experience with the durability of those.
Regardless of brand, if you havent used a bunch of FFP scopes with higher magnification before, I would want to use the one I'm considering before buying it to see how the reticle works for me at low power where most of my hunting shots are taken. I know you said you wanted more precision at 600-900 yards, but I assume that this means that you still want good useability at 75 yards or 200 yards, etc. Some people arent as finicky about this, but it's a must-have for me and I have not found many ffp reticles that I would buy for hunting.
Also, if you are planning to get a reticle with hashmarks to facilitate spotting shots, ranging, for wind holds or for holdovers, I would highly recommend a FFP scope if you are going with a top-end magnification more than about 10x, in order so you dont HAVE to be at max power to use the reticle effectively.