BEST COIN TO MINE WITH A RASPBERRY PI

the raspberry pi 3? has not enough processing and resource for computing of data for crypt o currency system, you need and powerful system like a HPE server with more GPU Power for this process.

Remember as well what you are competing against, GPU powered mining rigs (home based and "more commercial") as well as ASIC miners, i've wanted to do the same with my raspberry but I'm going to rather try and build a 3d printer with it!