I'm a fan of both. But I must say...
Ford cause I own one and it's never complained and just keeps going.
Also, it's 21 years old and hasn't lost any horsepower and drives like new. I'm not a fan of the previous Holden designs frankly I think the Falcon has aged better, but gotta love the having a Skyline engine in a Commie. But then again the Skyline engine is not native, so that can cause some technical problems later down the track. The Falcons engine is designed and built to be native and original for the car. The EA Falcon had massive quality control issues in it's first stages of development. And so did certain Holden models. Holdens have massive torque, so do Falcons. Holden dumps all it's torque in 1st, and Ford dumps theirs in 2nd.
Holdens have a horrible bogan reputation. Ford does as well, but no-where near as bad. They are mainly seen as a workers car. They both are styled VERY similarly, so naturally if you like the look of one, you'll like the other (unless your a hardcore fan and won't admit anything or say cliche lines like "I'll never set foot in (the oppositions) car" - I'm looking at you people above me...).
They are very similar cars and both rock. They need to get the Falcon out to the States though. People in the U.S. that I talk to are begging for them.