When I purchased the white gold box chain in 2012 I knew I had to get the yellow gold also.  I have worn the white gold chain since 2012, and my hair hasn't got caught in the chain, not once.  It's great.  I purchased the white gold 18 inch box chain in 2012 and have worn it just about everyday.  The box chain is the one you need if that's an issue for you.  Also, they are a lot stronger than they appear.  I'm pretty rough on jewelry and it still looks as good as it did the same day that I received it.