Bluetooth audio is choppy / stuttering on Macbook Pro (Mojave) but not iPhone
Looking at support documents at Jabra, the earbuds aren't designed for use with a computer:

No, we do not recommend you pair your Jabra Bluetooth device directly with a computer. Jabra Bluetooth headsets are optimized to be used with other Bluetooth devices, such as, smartphones or tablets. They are not optimized to be used directly with a computer. We cannot guarantee device performance or provide support for performance problems that may result from this.
If you choose to pair your Jabra Bluetooth device with a computer, it could work for audio streaming, but not for call control, which is not supported by many computers. Also, audio quality could vary depending on the model of the computer.