1st if playing against bots, but I'll take 2nd if the race has been a bitch and I can continue with a Silver. (this happens more often in Forza 5 because my older brothers drivatar is an aggressive stuff)
In multiplayers 1st-3rd is always nice (provided I'm not just racing 2 other people lol).
With my friends I would like to be 1st but I won't bitch if I don't do well. We just race for a laugh.