14kt White Gold vs. 18kt White Gold

White Gold....14kt or 18kt???

 I was in a jewelry store the other day and woman was speaking to the jeweler about changing her ER setting and DH's wedding band from 18kt white gold to 14kt.  The reason being was that their 18kt white gold did not "hold" the rhodium plating well, and had to be dipped every 3 months to avoid the "yellowish" look coming through.  The jeweler explained that the 18kt was nicer, more expensive, and it would be better to just pay to have the rings rhodium plated again.  The customer insisted on changing to 14kt due to how often they had to get them dipped @ $60 each time to keep them looking nice.  Is it normal to have 18kt white gold look so yellowish due to the actual gold content, or is it dependent upon the alloys used?  Unless you like the "yellowish" look, should you go with 14kt?

Thanks!