Drag Radials vs Slicks

Not sure if I should have posted this in the racers forum or not.
I am trying to decide if I should buy slicks or drag radials. I plan on racing my car a few times (3 -4) a year and I already have new BFG tires all the way around. Rears are 295/50R15 and is mini tubbed. Im going to buy an extra set of rims to mount tires for raceday but was wondering if the drag radials really work as good as a slick and will they last as long or longer then a slick. It would be nice to make the correct decision the first time. I will be running them on a 66 Dart with stroked 408 and 3:91, 4:11 or 4:30 gears with auto trans.
Thanks Rod