Why limit yourself to one venue? I posted my car on Craigslist, FB marketplace, and Autotrader. There was a fee for the latter, but it comes with a Carfax report that prospective buyers can download directly from your ad for free. I actually included a link to the Autotrader ad in the ads on the other venues.
Yes, there are lots of scammers, especially on CL, but be aware of their tricks (do some googling to find out what they're up to these days), don't do anything stupid (such as accept any other payment than cash) and you'll be fine. The guy who bought my car last year saw the ad on CL.