One of my favorite bands. Though their "Dance Till We Die" rap garbage, complete with expletives, is a track to skip.
I'm playing mostly Irish tunes with the goal of playing at a local brewery for St. Pat's 2022. I much enjoy Medieval and Renaissance music and have put together some sets. There are also dabble with some less than trad tunes...
Tune playing is my general approach too. Sometimes I warm up, both my self and the whistle, by doing an ascending/descending scale or two. Online and printed tutorials recommend exercises with cuts and rolls. Perhaps these would benefit me but the draw to paly tunes is stronger.
Sorry, I haven't been getting notifications & only just seen this - I think it mainly depends on your end goals.
Personally, I just play a tune or two, I don't actually structure my practice time, I only play for my own pleasure, & it works for me.
Playing scales teaches where the notes are, but equally, you could just play from tab.