If there's any cup, you're more apt to get thicker stock in the end if you rip it to width first before planing. Jointing I'm not sure if it matters, but I suppose you'd want to plane first and then joint?

Of course, that depends on how you plan on ripping it and if you can safely rip to width while the stock is in the rough. ( i have no idea what's safe if you're using a tablesaw since I don't have / use one. I've always ripped by hand or with a bandsaw since that's what I've had access to. )