Active basses have a preamplifier that boosts the signal from the pickups before it goes to the amplifier, giving the bass a more powerful sound. Active basses also typically have more features than passive basses, such as equalization and compression, which can be used to customize the sound.
Passive basses do not have a preamplifier, so the signal from the pickups is sent directly to the amplifier. This gives passive basses a more natural sound that is less colored by electronics. Passive basses are also typically less expensive than active basses.
Whether an active or passive bass is better is a matter of personal preference. Some bass players prefer the powerful sound of active basses, while others prefer the natural sound of passive basses. Ultimately, the best way to decide which type of bass is right for you is to try out both and see what you like best.