I agree ‘it depends’. A lot of Belgian beers tend to use beet sugar, syrup, or rock and UK beers use invert sugars, treacle, and the like. …and of course there was the ‘can and a kilo’ early on.
I’ve always been leery of sugar additions due to the threats of ‘too much’ produces a cider-y taste so stuck to less than 10% and more often closer to 5% but see many recipes go as high as 20%.