my earbuds are from HTC, they're authentic and as a call quality vs noise, it beat soundpeats free2classic and belkin soundform play , but as for volume htc is below them , anyways i added the models in ,y thread, and i bought both of them to test out and the summary is what i listed in the thread, both are acceptable, so it's either 5.3 with fast charging , a bit louder and lower battery , or 5.1 with huge battery but without fast charging and a bit lower audio, or return both and risk with new experiment lol

fast charging is a make up for low battery ? worth ? yes the one with low battery is a bit higher on volume and mic , i added models to the thread

Both are same brand , B model is just higher battery capacity, but i believe A case charger is faster? Another benefit from A model that it has a slightly louder mic and volume from a test call, although both should be the same 9mm driver