You may have noticed that the keyboard of a melodica is exactly the same as a piano, only smaller.
So if you’ve already had a few piano lessons, you’ll have a distinct advantage, as you’ll already be familiar with the piano layout.
Likewise, if you choose to learn the melodica, you’ll have an advantage if you decide to learn piano at a later stage.
Although they share the same keyboard, they have a very different sound. The piano has a percussive sound, as it uses hammers to strike strings. Whereas the melodica has a melodious sound. It’s a wind instrument, capable of sustained tones and expression.
Overall, the melodica is easier to play than a piano because you only use one hand.