Walmarts. Ten bucks a pair, and by the time they're good and stained and won't wash clean anymore, they're worn out anyway, and they just get replaced. Never had a broken zipper, either.
Never had Levi's, so can't compare.
Lee regular fit, the leg fits over my boots and don't blow around. The materisl is just as heavy as 10 years ago. Yes I have jeans that are 10 years old. Jack is it a mechanical problem you have with the zipper???