from what I understand there is more cryptography and NIDS/HIDS stuff on the 201 and more MAC, RBAC, DAC on the 101. I would go for the 201 and just make sure that you focus only on material that is for the 201 until you know it cold, and then you can look at some 101 material.
Also the pass for 201 is 750 whereas the 101 is 760. not much but every bit helps.
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