I personally prefer smaller blades, in the 3 inch range, regardless of any legal or social implications. I find 3" give or take strikes a good balance between control for more detailed cuts and size for bigger cuts, and they are typically 4 inches or so closed, which fits nicely in the front pocket of jeans.
As far as lightweight, for me it is not really an issue of "ugh, ive carried these extra 3 ounces all day today and now im tired". I tend to remove pocket clips and just let the knife ride inside my pocket, vertically, next to my wallet. So what matters to me is more of how a lightweight knife "floats" in the pocket and doesn't sink to the bottom or turn horizontal.
As far as lightweight, for me it is not really an issue of "ugh, ive carried these extra 3 ounces all day today and now im tired". I tend to remove pocket clips and just let the knife ride inside my pocket, vertically, next to my wallet. So what matters to me is more of how a lightweight knife "floats" in the pocket and doesn't sink to the bottom or turn horizontal.