The best stations of course are those that promote the following:
*The widest mixture of songs from all genres and eras
*Providing a pretty even mix of each song rather than having certain ones overplayed (Mariah Carey, I'm looking at you)
*Provide a proper seasonality by waiting until Thanksgiving and then gradually fading out between Christmas and New Year's Eve instead of pressing the Scrooge button at Midnight December 26
*Have proper contests relating to the season while promoting festive events
Looking back at 2019 and the most recent years, I've noticed quite a drop off in many midcentury titles in rotation and a trend toward a lot more 1990s to now recordings. It wasn't that long ago that Charles Brown's rendition "Please Come Home For Christmas" was at least equally recognized as The Eagles. But then that 2013 remaster especially but the former into the rotation, and only a small handful of stations spun the 1960 version written by Mr. Brown himself this year. Barry Gordon's (yes Xennials, that's Donatello from TMNT), "Nuttin For Christmas" was only played by WCIL and WYJB, the Andrews Sisters "Christmas Island" hasn't been played for at least several years, "Christmas In Killarney", "I Fell Out Of A Christmas Tree', and "The Marvelous Toy" are other former chestnuts that have disappeared from rotation. Yes, just like oldies radio, certain songs can fall out of favor.
In terms of the "Scrooge" button, I'd say about two-thirds of all stations going all-Christmas flipped back at midnight 12/26, with a few pressing stop as early as 6 PM (WKJY in Long Island), with others phasing out their festive stuff in the late afternoon/evening. A few stations like KDFC do plan to keep the spirit alive through New Year's Eve, and of course there's always satellite radio that keeps it like that.
Then you had WWNQ of Columbia, South Carolina play an all-country format for Christmas, which like some Christian stations with religious fare, can provide a specialized format that isn't what you'll typical see on the AC Station. Also, I expect the playlist of a Classic Hits station to vary compared to a Hot AC; the former is '60s-'80s based with a sprinkling of '40s-'50s and a few '90s, with Hot AC being younger ('80s-'90s centric with some New Millenium songs and some '70s, but not to the point where it should totally abandon "Holly Jolly Christmas" or "Rockin' Around The Christmas Tree'.
Now when the Christmas playlist starts to sound like WHTZ (with "All I Want For Christmas Is You" the oldest song in the rotation), then it will be time to cry.