The two main accordion families differ in the treble (right-hand) side layout, which shapes both learning curve and which musical traditions they're associated with.
Piano accordion
Uses a familiar piano-style keyboard on the treble side, making it the more intuitive starting point for anyone who already reads piano music or has keyboard experience.
Button (chromatic) accordion
Uses rows of buttons instead of a keyboard - a more compact layout with a smaller reach across a given range, and the standard choice in many folk traditions (e.g. Eastern European, Latin, Cajun styles, among others). It requires learning an entirely different fingering system with no piano crossover.
Making the choice
- Switching between the two later is a genuine relearning process, not a quick adjustment - the fingering logic doesn't transfer.
- The right choice depends more on the style of music and community you want to play in than on which is objectively "easier" - both have deep, active playing traditions.
For a complete beginner without a strong pull toward a specific style, prior keyboard experience is the main practical factor tipping the choice toward piano accordion; otherwise, it's worth choosing based on the repertoire you actually want to play.