As usual there are those who only use headset...
And those who are lovers of blasting speakers.
xxx
Now a bit of education as it appears required.
Suppose you use only one source, call it "speakers only"...
If speaker fails, and dont have the earset (one ear) you might not know about a failure.
Or vice versa. I personally recommend low/comfortable volume
on both in case one fails.
xxx
Of course, I am deaf as any pilot who spent in excess of 10 years in airline cockpits.
But the way you kids blast your ears with modern music I believe your ears wont be better...
xxx
Happy contrails