There's little difference between the K5 and K6.
The K5 and K6 are essential handheld radios, primarily because of their versatility and functionality compared to other models. They focus on practicality.
The BaoFeng UV5RH/M, while relatively new and not expensive, still doesn't offer the same level of comfort as the K5 or K6.
If you are looking for machines with a power output of 5W or more, you can consider models like the Yitu Tong 6800.