Each bakery has its own recipe.
How do you like your bun, what amount of cream, the taste of the almond cream filling, even the way the lid is cut is important to the connoisseur. Some bakeries experiment with different fillings and spices but then it is not a proper semla to me. Some newspapers even perform their own Semla testing.
Then the big question is how to eat it.
In the past many people had it soaked in hot milk but I think nowadays more people eat it just with their coffee.
Semla is most commonly associated with Shrove Tuesday (we call it “Fat Tuesday”) as a fatty and decadent kickoff to that season of deprivation perhaps better known as Lent; however, according to Sweden.se
(“the official gateway to Sweden”), the delicious treat “has arguably outgrown its religious symbolism”, noting that