Good questions. My carbines are used for home / backcountry defense and "practical" competitive shooting.
The ATACR 1-8 is an excellent scope, but very spendy. The new S&B 1-8 looks like it may be the one scope to rule them all, but at nearly $5k it better be. Have a look at this review for what my perfect LPVO looks like. I will not be buying one unless I win the lottery.
https://www.thefirearmblog.com/blog/...chmidt-bender/
The EOTech Vudu 1-6 with the SR-1 reticle is my favorite LPVO for the money right now. It checks all the boxes for around $1200, and can be had significantly cheaper on sale.
https://www.cstactical.com/eotech-vu...ffp-riflescope
I haven't had time behind any of the 1-10x scopes yet, but am skeptical. Every 8x or 10x scope I have used comes with significant optical tradeoffs--especially a cramped eye box. I would take a wide, bright 1x in a 6x scope any day over a 10x without that.
Daylight bright illumination and true 1x. I want my carbine scope to perform nearly as well at 1x as an Aimpoint or MRO. I have to be able to shoot both eyes open with target focus, move with rifle mounted, fast target transitions, etc. All the things you need to do for high hit factor shooting with a carbine.
Mil/mil: I do not use MOA scopes because there's no reason to. A BDC style scope can be useful though, but I still prefer mil turrets.
FFP: I want to be able to use reticle holdoffs for elevation and windage at magnifications ranging from ~3x to max. This is especially important for moving targets.