Which version of Kodi should I install?

I have an Android TVBOX with the following characteristics:
Amlogic S905X Quad Core ARM, Android 6, 2 GB ROM 16 GB.

I have kodi 16.1 already installed on it, but when I want to update with the version 17.1 it does not allow me.
I’ve read lots of comments here and I realized that first I should uninstall the existing kodi 16.1 and then install the kodi 17.1.
The problem is that I don’t know which version should I download, in order to install on my device. I will be thankful if you tell me which version should I install on my device from the following existing version:

RC: ARM – x86 – ARMv8A (64bit)
Nightly: ARMv7a (32bit) – x86 – ARMv8A (64bit)