I can't speak to results with fe fit as I haven't done it religiously, or enough, but in comparison to Dream Body they are pretty different.
As you know with DB, they are "frantic" as most people describe, but I still
them and the results are fantastic.
Fe fit is much slower and there is more differences between the types of workouts - barre, cardio circuit, total body, lower body, upper body. They are also only 30 minutes vs the hour long DB workouts.
I definitely enjoy my fe fit on occasion and I love the timeframe, and I don't know if they'd deliver results - but I know several people have posted here about fantastic results.
For me, I look at the DB as a challenge, and something to grow into. I always go at my own pace, but can do most of their workouts. My legs get awesome thigh definition like nothing else. I also respond well to the bodyweight they throw in there. I despise pure cardio, so these always leave me gasping for air, but I know each time I do them I am growing.
Fe fit comes with a 90 day rotation and I don't doubt they'd give results. I think there is also an option to double up for hour workouts per day.
I'm glad I have both. I just did a fe fit last night with my daughter. I plan on doing a DB tomorrow.
I'm not sure how much this helped and if you have any other questions, please let me know.