both! theyre both very different experiences. the anime left some good stuff out of the manga (+the art is better imo and its interesting to see the gradual evolution of araki's art style), but the anime is fun with the amazing OPs (imo jojo has some of the best OPs in all of anime), music, and dramatic editing. plus the anime is only just now animating the 4th arc of jjba, but the manga is already up to its 8th arc! by the time you catch up, if you enjoyed it, you might want more and want to read the manga for more content.
u gotta keep in mind with jojo it can be very campy/humorous, and some people take that as reason to take it lightly/like it ironically, but i enjoy it most taking it seriously! it does have very dramatic, immersive moments. to top it all off you get a bunch of beautiful eyelash-heavy lipstick-wearing muscle men
i really hope you enjoy it if you do decide to try it out!