Been to DCA's F&W three times (four in March 2019) and Epcot F&W once (going back for seconds in September). I like the intimacy of DCA's festival, but the sheer quantity of booths in Epcot is amazing -- we could only scratch the surface during our week-long visit in 2017. However, Anaheim's weather trounces Orlando's, so I found it difficult to drink red wine or eat hot dishes in Epcot (in October!) whereas DCA should be lovely, but might have a little rain in March.
A recurring report for the past few years out of DCA's F&W opening weekend is that they seem to underestimate quantities and run out of items. Maybe that won't be an issue in 2019.