While the Huawei Band 4 Pro is slightly more expensive than other fitness wristbands, it also comes with a few extra features: An integrated GPS, AMOLED display and in some countries, even NFC functionality. Here, we summarize our test results.
https://www.notebookcheck.net/Huawei-Band-4-Pro-Convincing-GPS-performance.451325.0.html
Swim tracking is very dodgy. Indoor is bad and outdoor is useless. Distances, splits and times are random and wrong. No heartrate for swimming but not advertised. I swim four times a week in the ocean or pool. Have used the 4 Pro for four weeks.