Man, didn't know that the FF reputation was this bad, only one vote?
That's because this is a GT5P question. In real life, it'd be vastly different.
On any videogame, you tend to be driving the car at 11/10ths all the time. This is why people beeyotch and moan about how twitchy cars like the Clio V6 (in GT4) or the Ford GT can be. Well... duh. They're mid-engined cars with hardly any aerodynamic downforce and engines that are pretty heavy compared to the rest of the car. A F430 Scuderia has more downforce and less weight over that rear axle than a Ford GT, and is understandably tamer, but I've still seen newbs go all over the place with it.
In real-life, however, a GT would feel epic to a first timer. Tons of grip. Great handling. Complete unflappability... at 8/10ths. Which is about as far as most people have ever driven.
At 8/10ths, a front-driver can feel manic. In fact, at 10/10ths, it can be downright fun. Trail-brake, lift-off, scandinavian flick... any of these techniques can be used to get a drift going through a tight corner. Of course, in a video game... you can't
feel your way into a drift... all you know is that you're pushing 10/10ths (and badly, at that, diving too deep, turning too late, using too much lock) and the car is understeering like a pig.
Drive like a racing driver, and you can appreciate an FF's merits. It's light, nimble, tossable, no on-throttle oversteer on corner exits, which means it's more forgiving of poor pedal-work, and power-on understeer is a big advantage in real life when another driver tries to shunt you... keep your foot to the floor and countersteer and the car will eventually straighten out. In a RWD car, you have to let off gently (take your foot completely off, and the weight shifts forward, and you spin harder... use more gas and you increase the spin... whee.), countersteer and pray. I think the prayer part is the one that works best.
Of course, at racing car levels of grip, an FF just has too much grip to take advantage of lift-off oversteer (though some FF racers are incredibly twitchy off-throttle), and an FF will never have the off-the-line traction of a 4WD or even a RWD, but all else being equal, it can be competitive on the track with other cars.
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After saying all of that... I prefer MR.
But for the balance of predictability
and nimbleness, in-game... I'd have to go with the generic FR platform... a little more understeer, which lets you take more liberties in corners, at the expense of off-the-line traction.
In real-life, having driven most everything (except an RR... though I'm waiting for someone stupid enough to offer me one...
) hard, I can honestly say that it really doesn't matter where the engine is and which tires are spinning, as long as the car doesn't steer like a pig, which it can do whichever axle is doing the locomotion. (Some RWD cars steer like absolute pigs compared to my FF at 10/10ths).