Yes, well-designed and made custom calls are better. It isn't to say they're better at actually killing than a well-tuned factory call, but you will get truer sound and easier play. I do believe having a custom call makes a difference on hard pressured birds because you can do more with one.
As for which is the best type, you really have to try them in person to see what suits you. Then you get to see which of what suited you the turkeys prefer.