If setting Output Resolution to High doesn’t yield smooth enough lines, then you would need to render the edges as vector lines which is what Hybrid does. The fact is, as long as you insist on rendering the viewports as raster, the edges will be rasterized and won’t appear sharp like the vector lines do.
maybe you just need to turn off edges in the style you use for the scenes in SketchUp. Then it wouldn’t matter.
Maybe you’d get more acceptable results if you export PNG images of the pages and then insert them into a page editor to create the PDF.