1997 Ghibli II 6 speed vs 2001 Assetto Corsa

Quite different cars, two different generations.
If it is a true AC, that one is a collector, very few of them (an additional premium if it is a manual). For the same price, same condition, that would be my choice.

 

I'm surprised, I thought you preferred the ghibli.

Owning both, I think it's really a tough choice.
The ghibli is 200kg lighter, and with the shorter gear ratio, I think it's a little bit faster. It's more raw for sure.
The 3200, even in the Assetto corsa version is a little more GT, with more creature comforts, and a design to die for.
Both car are still analog, with not too much electronics interfering.

About the reliability, you'll have more problems with the 3200gt, I think. The engine is bullet proof, but the electronic can sometimes play a trick or two.
But it's not as bad as you would expect. The ghibli is less troublesome.

Maintenance cost is about the same, and there is nothing really complex, even the timing belt change.

The ghibli, even the GT, are cheaper than an assetto corsa, most of the time.
The ghibli cup is about the same price, or even more expensive (and way more rare).

I think the ghibli is more special, but the 3200 is prettier, nobody can argue about that and often easier to live with.

Tough choice, take the two!

The ghibli
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And the AC
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I am caught!
But it's unfair, you take a Cup to compare to the AC...
And the OP was more about a GT car, hence my advice for the AC