I'm doing a project which needs to display guitar chord patterns on a display using IoT. which board(Arduino or raspberry) and display is more suitable?
Raspberry is much more powerful than Arduino, but Arduino is cheaper and requires much less energy. Also, your network connectivity requirements are unclear, but in general, the Arduino is much limited compared to the Raspberry, in terms of connectivity.
If this is a one-off project, the additional cost is acceptable, and you have no power constraints, the easiest would probably be to use the Raspberry.