Billet can have grain structure, especially if it's pulled. Problem with saying it's billet, cnc machined, or forged for that matter, is those terms by themselves are not really definitive descriptions. Chances are though, whatever is cheapest to do within the respective processes is probably what has been done. With no more explanations given, chances are that the CNC Brand forged crank would be strongest, because it has been heat treated, where as the Shun Brand one has not (it just says "CNC machined"). The Shun Brand chainring is described as 6061 Aluminum (technically, it's an aluminum alloy), whereas the CNC Brand chainring is described only as "alloy"; that could be almost anything. So, still sorta a toss up.