Well I couldn't find a 3x for a while, so first got the 4.5x ... but then finally found the 3x ... for me .. I would definitely want the 3x ... and even that's rather high ... I live along a wooded creek and I'd prefer a 1x.
But if you live in like SD near like Mitchell and nothing but miles or flat fields ... then I'd get the 6x ... so depends on your terrain. The more magnification, the less FOV, the more FOV, the less magnification, classical trade off.
The 3x I got does NOT have the onboard video. The 4.5x does, though I've never used it. But if you want that, make sure the one you get has that.
I also tried mine as a weapon site behind a 1x RDS ... and it worked out to 100yds ... they had a special mount for the equinox that would mount it to a rail.