I don't notice any difference between the Carter and Edelbrock carbs I have used. I think the Edelbeock thunder series (AVS style) has boosters in the secondary where the Carters didn't, but I haven't used a thunder series carb yet?
The main issue I have with type of carb is getting the fuel level set correctly. If the fuel level is too low from either low pressure or the floats set too low, the carb won't have a good accelerator pump shot and will alaways seem to run lean. I usually error on the side of setting the floats for a high fuel level, and after running the car, pull the top of the carb and making sure the fuel level is upto the notch in the splash sheild.