I agree with Jerry, I had them both, I prefer the 8.5.
I would recommend the 8.5x42 EL, as it is a great size, 8.5 X offers some nice advantages.
It has long been considered the "universal distance viewer", and you mention you prefer a lighter
It seems you already have a quality 50mm binocular, now is the time for a top 42mm.
I hope this helps.