Which Frosting or topping is the most stable to use on a wedding cake

Thank you for your replies. I’m going to test the Italian and the cream cheese frostings.

King Arthur Baking did a test of the frostings in hot weather: https://www.kingarthurbaking.com/blog/2018/08/17/best-cake-frosting-hot-weather

Shockingly, the found cream cheese frosting to be the most stable
Italian meringue buttercream is my favorite and more stable in hot humid weather than American buttercream. Plus it tastes way better and looks great on wedding cakes.

Royal icing is one classic Strong but not much taste.