For most cars, for autocross, your ideal is to reach about 65 mph in 2nd gear.

The exception might be if you had a low-power or low-revving engine, then you might trade that extra shift for shorter gears.

But... if you don't have the experience and skill as a driver, it's not going to matter a bit how the car is geared. Don't get too bogged down in the details of setup, get out there and drive!