If you're looking for a portable Bluetooth speaker that can fill up a room with sound, the JBL Flip 4 is a great option. It's well-built and has good battery life, making it ideal for outdoor parties or picnics. The Charge 3 is also a great choice if you're looking for a portable speaker, but it has some drawbacks compared to the Flip 4. First, the Charge 3 is not as loud as the Flip 4, so it may not be able to fill up a large room with sound. Second, the Charge 3 doesn't have as much bass as the Flip 4, so it might not be ideal if you're looking for a speaker that can really pump out the tunes.