Are the both sentences below correct? A friend of mine claims that it's not possible to use whereas for this expression. When I look for their difference I could only see that we shouldn't use whereas for expressions with time.
Freedom is a slippery concept, and whereas we may casually use the word with some frequency, it is difficult to arrive at a precise definition that is agreeable to most of us.
Freedom is a slippery concept, and while we may casually use the word with some frequency, it is difficult to arrive at a precise definition which is agreeable to most of us.