Single vs Dual Plane, big difference?

I read that dual planes are better if you are not reving high. Back in my younger years when I had a different cam in my 67 GTS I had an Edelbrock Trantula single plane on it. After the restoration and a pretty close to stock cam I kept it on. Never had a throttle response problem with it running with the stock Carter. Of coarse if you take the carb off and look through the top of the manafold where the carb sits you can see the valves. It's a pretty straight shot. Always thought that was cool.