I've owned a MOD3-B for a couple months now and tried it out as a monocular for comparison's sake. It's nice to have that ability for the select few specific times it can help, but I'd be extremely sad to lose the binos for full-time monocular. If it's one or the other, binocular without a doubt. Binos that can rotate to the side like BNVD accomplish mostly the same thing, but there is the extra benefit of having the ability to use the other tube as a solo monocular with the MOD3, like if you want one on a lanyard or a small handheld.
Full disclosure, I'm not a hunter or super tactical operator, I just like to fool around in the dark and look at stuff through my WP MOD3's.