Which API between CSOM and JSOM propose most possibilities of customization ? (I mean, can I do the exactly the same things with this API's)
closed as primarily opinion-based by Aakash Maurya, Robert Lindgren, moe, Mohamed El-Qassas MVP♦ Jul 10 '17 at 9:23
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If you know the difference between these two then you can easily decide what you should choose.
If you need to learn more about difference between JSOM and CSOM, here are certain helpful resources.