Ayer beer is a fermented beer, which means that the yeast floats on the warm wort, and the fermentation temperature is higher.
This fermentation method can retain the hop aroma to the greatest extent. Lager is a bottom-fermented beer.
The yeast is under the wort, and the fermentation temperature is lower. This fermentation method is easier to industrially produce.
Due to the different fermentation methods, Ale beer will first smell the aroma of hops, yeast and other additives, and then the aroma of malt, while lager is just the opposite.
First, the aroma of malt will be felt, followed by the taste of yeast and hops. Usually Ale smells better than Lager.