In games in which they played and finished last year:
McFadden: 111 carries for 610 yards, 18 receptions for 151 yards, 5 total TDs (6 games)
1 PPR: 20.68 points per game
1.2 PPR: 21.28 points per game
Forte: 198 carries for 985 yards, 52 receptions for 490 yards, 4 total TDs (11 games)
1 PPR: 20.32 points per game
1.2 PPR: 21.26 points per game
In PPR they were within 0.36 points per game of each other, and if you got 1.2 PPR they were nearly identical. Add that to the fact that Forte has played in 60 games to McFadden's 45 even though they are both going into their fifth year in the league. I'm okay giving up 0.36 points per game to get a guy with a much healthier track record.
This is exactly why I have Forte at 5 and McFadden at 6 (RB, PPR).
The only edge DMC has on Forte is speed. That's it. And speed isn't everything at the RB position. Many of you are too young to remember Walter Payton. He didn't have game-breaking speed. But he was the finest halfback of his generation and one of the best of any generation.
Let's take a look at Forte vs. McFadden. We will include only games started and eliminate the games each suffered season-ending injuries in.
Forte: on pace for 2145 total yards; 20.5 ppg. (11 games)
McFadden: on pace for 2029 total yards; 21.2 ppg (6 games)
The scoring difference was minimal and can be attributed to TDs alone. As everyone knows, TDs come and go, and are hard to predict.
McFadden is the flashier player; Forte is more productive and more reliable.