I have used both chucks for years and give my honest review. Plus insights on jaws and faceplate options.
*** I’ve read on Aawforum.org that these jaws are interchangeable. I confirmed today after a question on here that they are not compatible. The attachment holes closer by a mm or 2. That may make the Oneway a better option as their jaws are much less $$ than Vicmarc jaws.