The best replacement for jffs2 is ubifs.

The best alternatives to jffs2 are rated as following:
★★★★★  ubifs
★★★★★  yaffs2
★★★★★  squashfs
★★★★  squashfs openwrt
★★  cramfs
★  ubi
★  yaffs
  jffs

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jffs2
ubifs
yaffs2