Piano. Professional piano lessons will teach you how to read sheet music which is always a useful skill to have especially if you would like to eventually write music. Also, most electronic music is composed with computer and keyboard so piano experience will help a lot with this.

Drums however is greatly sort after by bands starting out because drummers are hard to find. If you go into playing drums, this will be a separate thing to any other instrument you choose to learn. But, if you master it, you will find it way easier to join a band.