one of the main difference is kk 2.1.5 has auto level so the board will try to level the quad automatically whereas this feature is absent in the kk5.5
whereas on the other hand the kk 5.5 is also easy to set up like the 2.1.5 and the gyro gains can be changed while you are flying( i mean just after landing)
well i will recommend you the kk2.1.5 cause i have a kk5.5 , the board is excellent no doubt for its cheap value but the kk 2.1.5 has more features so go for that
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