8.5 swaro EL. I tried 8.5s and 10s for about a month, side by side. The 10s magnify more moisture in the air and shake more. Out to 2000 yards there was barely any difference in magnification value in identifying animals. But the vibration and magnified water made the 10s worse. Having a dead solid rest for the 10s help. I wanted binos i could use for everything, theater, birding, close in and far. The 8.5s give a wider FOV. I use them for prairie dog shooting and can easily spot the little doggies at over 1000 yards, mostly beyond shootable distance (on average).( I know some of you have shot PDs at 2000 yards!. Lol). Looking through 10s, on your elbows, for 10 hours, with mirage, is no fun. 8.5s are much better, imho. Also, lesser mag allows more light to enter for low light. However, i have 10s also, but less expensive. If you only have one choice, id go 8 or 8.5. Or 9 if you can find that. I have zeiss 7x42 BGATs which are awesome and i was never hindered by the 7s. I got the swaros 25 years after the zeiss. BTW, the zeiss are up for sale. I can only use so many at one time. Glass is like new. Immaculate. $1500.