I have no technical expertise on the matter, but I'm thinking changing color temperature before or after would result in almost no difference (Relative to more dramatic changes you might see with sharpening, etc).


If I'm doing a setup for a shot where time isn't of essence, I shoot with custom Temp on camera. It allows me to visualize what my final shot would look like better after post processing. But that's not always the case, so I shoot Auto pretty much 95% of the time.


When it comes to color balancing in post processing though, unless I was shooting with a bright color gel on my flash, I've never had trouble adjusting to the color I wanted. So just for the sake of saving yourself some time during the shoot, I would just go Auto!


EDIT - I shoot raw 100% of the time, so I don't know anything about shooting in JPEG. But I guess Daniel answered that one []