They're all pretty cool, tbh. The greats literally invented the bass-line. However the (upright) bass itself is relatively modern (1800's?), thus many of these lines were for keyboard/organ. IMO, it makes the parts feel virtuosic. Plus the non-meteonome feel and key modulations. No backbeat to groove, lol
I got Beethoven check'd on a livestream a month ago, taking user submissions. It was like getting caught with your pants down-- Or like getting called to sing the chromatic scale in front of class. It made me want to dive into more classical lines, too. Its all vocabulary! :]