It isn't quite that simple of a question. In the trade for Chriss the Kings acquired Papa, Skal, and Bogdanovic. I make sure to point that out because I'm with you if Chriss was traded straight up for Papa but he was not.
With that in mind the question needs to be restated like this: who has the potential to be better Chriss or the combination of Papa, Skal, and Bogdanovich?
That is why in my earlier post I stated that unless Chriss becomes a perennial All-Star and none of the Kings players become eventual starters, that it was a good trade.