Which one should i chose? I’m 13 years old………. which one would be easier?
I would say learn Piano. Piano is like a base instrument. Once you learn the piano you will easily be able to understand every other instrument and learn it a lot easier. You will learn bass and treble clef, all your scales and basically everything you need to know to play any other instrument. You might feel kinda geeky playing piano at first, but after a few years you will be glad you chose the piano. Because you can just transfer everything you learned from the piano over to the guitar.