Imagine a character in a TV show saying: "Come on, Johnny. Drink this orange juice because it has 100 percent real fruit juice straight from Florida!" That would suck. I totally see her point.
Also, I got the impression that she enjoyed working in both shows. She was just observing that the look and feel of the shows was different. It's interesting that she would make that particular observation since DS9 is considered the darkest of the Star Trek series. All things are relative.