I have both- although the DFP is better overall- the momo has a few things that are really nice.. The shifter paddles are 100x better on the momo- Very big and and work great. The DFP- which needs bigger ones - uses tiny buttons on the back... makes it impossible to shift when turning the wheel 900 degrees really fast.
The wheels are the same diameter- I measured, but the momo has a thicker beefier wheel- feels really nice. The Momo's stick shifter can be moved from left to right easily. There are good sides to both, but the metal bearing in the DFP and the 900 degree rotation makes it the best.. All the buttons are icing on the cake. The tiny shifter paddles are the big downside.. but you can get used to them.
Pedals are about the same, but the revision B00 DFP has metal pots that are light years ahead of the old ones in the momo and older rev DFP. For LFS, the DFP is great though.. matching rotation with steering wheel rotation on the car in game ads a level of realism that the momo can never achieve.
The momo also has a big plastic bushing for the main bearing.. it loosens up over time and also makes more drag. If the momo had a metal bearing and 900 degrees of rotation.. it would be awesome.
I have an idea for a mod to the DFP that would give me some big shifter paddles without permanently modifying it. There is a spot on the shaft that you could secure a round clamp to- and off that clamp attach a piece of plastic shaped like a big shifter paddle and it would activate the button when you pulled it. I could make them really big too- a lot bigger than the momo's That would help shifting when cranking on the wheel.. There is about an inch of space to work with- it seems like it will be a fairly simple mod.. The only problem is the space between the wheel and the wheel base. It might be hard to get paddle in there without hitting your fingers on the base every time you shift. The momo's shaft is 3 times the length, and makes the wheel a lot farther away from the desk when clamped down..
That is another one the DFP's advantages though.. The footprint on the desk is way smaller, about half. It takes a lot less width and a a lot less depth.. The DFP is much smaller overall, which is great for smaller desks. It also extends beneath the desk only a tiny bit where the clamps are- the Momo had this huge contraption that hung down in the front about 3 inches. I was always banging my knees on it..
Anyway- I think for the price they are both great products- especially if you get a Rev. B00 DFP.. But the DFP will last longer with it's metal bearing and has the huge rotation.. Just for those reasons, the DFP is better overall even with it's tiny shifter paddle buttons.