I wouldn't call the class-inherent features of KOMA-script "better" than
geometry -- KOMA-script offers a typographically sound default layout plus minor customization abilities, while
geometry allows for a multitude of layouts (including some that are outright ugly).
As Altermundus pointed out, one way to make more lines fit on the page is by setting KOMA-script's
DIV option to, say, 12 (with 10 being the default value for A4 paper and a basic font size of 11pt). However, this will not only increase the number of lines, but also the length of single lines, which in turn will at some point hamper legibility. An alternative solution is to use
geometry to increase the height, but not the width of the text area -- i.e, a layout that features different proportions of height vs. width for the paper size and the text area. Here's an example that combines A4 paper with a golden ratio text area: