Wich one should I use?(initramfs-kernel vs squashfs-sysupgrade)

Hello my friends. I have TP-Link TD-W8970 and OpenWRT 19.07.1 already installed on it.
I noticed that we have a new release of OpenWRT (19.07.2 --> Current stable version), so I decided to upgrade my OS, but which one should I use?

and here is the related directory

And also, please tell me the difference. Thanks.

Sysupgrade, when you upgrade from an existing OpenWrt image to another.
The other one is used to convert from factory image to OpenWrt.


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