So its the harmonica vs the drum kit.
I’m biased, having learned to play half a dozen musical instruments and having decided long ago the most practical one to play by far is the harmonica. Inexpensive, portable, expressive, and entertaining, with just enough volume to enjoy without becoming a nuisance, and yet still uncommon enough you will never appear the cliche anyone holding a guitar instantly becomes. Its hard to think of a better instrument to be good at.
I’m biased, having learned to play half a dozen musical instruments and having decided long ago the most practical one to play by far is the harmonica. Inexpensive, portable, expressive, and entertaining, with just enough volume to enjoy without becoming a nuisance, and yet still uncommon enough you will never appear the cliche anyone holding a guitar instantly becomes. Its hard to think of a better instrument to be good at.