Which is better, PPAPI version or NPAPI version of flash?

You can't say which one is good, only which one your browser supports.

So far, only the new Chrome browser supports ppapi, and other non-IE browsers support npapi.

Ppapi standard was originally put forward by Google to improve the security of plug-ins, but in fact, it is only supported by Google's own browser at present, and others such as Firefox are dismissive of its standard.

For flash, if we have to compete, of course, npapi is better than ppapi, because ppapi version of flash does not support hardware acceleration, so we often encounter the same flash file. ppapi plays hard, but npapi plays smoothly.