Whenever I'm by the airport I scan all the main frequencies (tower, arrivals, departures, ground etc). There's usually something of interest on all of them. I have no favorite.
I also like listening to the big aircraft up at cruising altitude. (Flight level 360 and above). You can hear them from hundreds of miles away. There's very little in the way of voice traffic. Usually they just announce their call sign as they move from sector to sector. But, I like looking them up on Flightradar24 as I hear them to see where they are.
https://www.flightradar24.com/