I just came inside from a quick view with both the Legend M and the Vanguard Endeavor ED II, both are
8X42.
Bruce has both in 10X42 so I'll defer to his optic judgement. He does a better job of explaining some optic details and would never steer you wrong. Both optically are very nice. Both have been compared to binoculars costing much more. I like view of the Endeavor ED just as well tho I'll for give the FOV advantage to the Legend M.
I like a focus adjustment with minimal slack/play. The Endeavor ED II gives me that, the Legend M doesn't. The Endeavor is excellent in fact. I'll have to call the Legend M as below average.
Both binocular have a good feel in the hand. The Legend is a little longer and it feels lighter than is it. Eyecups adjust better on the Legend M but both will suffice. The Endeavor ED II DOES give the impression of being a little better quality.
My Vanguard is going on 3 years old and has been exposed to the worst conditions of any binocular I have. It basically STAYS in my truck and even today, functions as did straight out of the box. I don't take it inside in the high 90's and I don't when it's in the teens. No idea what the actual temperature of the truck is.
For sure the Vanguard comes with a nicer included case but the Legend M is good enough.
I RE-read your initial post and noted your use of the binocular. I know first hand about early AM and sunset viewing and know how important that is. A full 10% of transmission difference IS a difference especially for your usage. The Legend M gives you that according to the only data we have and that is probably more important than a better focus adjustment. So I'll have to give the Legend M the nod here.
I quickly took a pic of both binoculars side by side....sorry iPhone photo and lighting conditions were bad and flash is a JOKE!