不是……就是 vs 不是……而是（近义词）

1)不是……就是……means"either... or...".Words,phrases or clauses can be inserted.The inserted elements are often similar in meaning and structure.
2)Sometimes the structure "either...or..."is not applied to actual persons,things,or actions,but two specific things that indicate a certain state. e.g.:

1)不是……而是……，not…but,stresses the latter of two things and all sorts of elements can be inserted.并can be used in front of不是：