The choices and resulting codegen are fairly different. Only one of them works "properly" as of today. Though I'm open to be proven wrong once Panama vectors get stable in the Java land.
They will only be out of preview when Valhala ships, as per roadmap.
Then there is the whole issue when will they reach other implementations beyond OpenJDK, specially a very important alternative implementation running on many phones across the globe.
Nevertheless the need to explicitly being allowed to write vector code is there.
