I think it depends on what type of 209 gun you have. I have tried every brand of 209 you can think of, including the Remington 209-4's in the plastic primer carriers.
Winchester W209, Winchester WML209, CCI, Federal, Remington Kleanbore 209ML, Remington 209-4 Premier primers, Winchester Triple Se7en SML209T7. Don't like any of them in primer carriers.
I have the .25 ACP plug, and won't be going back to 209 anything. I use CCI 400 Small Rifle Primers in the .25 ACP brass. "The Better Primer Carrier"!