One is a writing system that depicts concepts with classy strokes and has thousands of years of history; the other is a bunch of redundant Fisher-Price looking drawings without semantics added to Unicode by a corporate committee.
Chinese writing is the OG wrt Japanese kanji, but it is preceded (independently) by Egyptian hieroglyphs, which, if you want to compare OG-emojis, I submit for your evaluation 𓂸 and 𓂺 as being better eggplants than an eggplant
That said, why is a Japanese sentence written using one set of pictographs respectable and proper, but another set of pictographs means the writer is in kindergarten?