Is it easier to play the trumpet or the mellophone?

It depends. The Trumpet uses less air, but it takes alot to get high notes. And same goes for mellophone. They are heavier than trumpets and lower in some volume, notes wise. Like, if you played french horn, it would be easier to play mellophone because it is in the same range with fingerings and air volume. Trumpets are the same throughout. But in conclusion, they are pretty much the same. The only difference is sound and weight.