If you balance magnification and exit pupil to keep a 5mm minimum exit pupil, you will be fine.
Good glass and coatings costs money. Buy as much optical quality as you can afford.
Big objective lenses have big parralax errors. Go for less power with a smaller objective or accept the need for side adjustable parallax.
If you go 50mm or 56mm and over 10x you will NEED adjustable parallax if you care about precision.