Best way I can sum up the difference. Last couple of years, we've done several combos where it's a 100% spirited street cruiser with conservative spring rates focused more on ride quality. While Bilsteins provide their usual good but firmish ride and excellent control, with same springs they fall well short of a Koni D/A. Does that make the Bilsteins a bad choice, absolutely not but if the budget will allow the upgrade you'll never regret it.