The main difference between raw and jpeg is the size of their file. RAW would be ideal for bill boards. So RAW is definitely the bigger file. Yes you can convert your image from RAW to JPEG even after it’s already in the computer but it would affect your quality. I would say I would rather shoot in RAW for an important event, that way I can capture more and with better quality. But if it were an event were a lot would be happening and things move quickly, I would shoot in JPEG because with JPEG I can shoot many more pictures at once.