The supercharger will give the best drivability, and the best fuel economy, of the 2 options.
We drove a VN Group A (Original, not a mock up) with a 348ci holden motor, and the group A top en, with centrifical blower on it. Running the factory ECU, from Southern Melbourne, to Canberra, did the shopping, went to scruiteneering (Summernats) and then to the Summernats, with a boot load of crap, and 2 people.
It averaged 8.1l per 100k's, and did it on less than 1 tank of fuel. With the same tune, it made 684hp at the tyres, on the Summernats dyno, and came 3rd in Horsepower Hero's, then we drove it home again.
It ended up making 506rwkw, over the next year, before it was sold.
Drives like a kitten on the road, until you open it up.....