Which is better?

[MarkGrigsby]

I'm hoping some kind expert could maybe answer this for me. Which is 'better':

a) 30 progressive frames per sec, written to NTSC DVD and therefore showing on TV as 60 interlaced fields per sec

b) 60 interlaced fields per sec, constructed from 60 genuinely progressive frames, written to NTSC DVD and showing as 60 interlaced frames per sec.

Hope this makes sense....

[Baldrick]

https://www.videohelp.com/forum/viewtopic.php?t=266340&highlight=
just reply to add more information.