When you've learned to call ducks you'll want to go with a quality single reed. I've recommended the cheaper Rich-n-Tone calls to friends who didn't want to drop $150. If you aren't too good at calling yet a double reed will erase some mistakes and keep you from making some more. Unfortunately a double reed significantly reduces your range and things you can do. Think of a double reed as a duck call with training wheels. Think of a triple reed as a wagon you carry the "special" kid in.
I've been fortunate enough to grow up around several state champion callers (including my father) and one world champion. I've had the opportunity to blow boxes of custom Echo, Rich-n-Tone, and Starks calls among others. Now I blow a soft little woods call made by Sam Heoper. Their line is called Smooth Talking Mallard or STM. My advice, for what it's worth, is go somewhere and blow a bunch of calls. One good call will last you the rest of your life so it's a good investment, and you won't be one of those guys with 10 calls around their neck switching around all the time. If you can, go to Stuttgart for the Worlds. All the call makers are there with cases of calls. If not, go to whatever local competition you have. There will be guys there with their calls for sale.
Now for goose calls I'm not as much help. I've blown a Grounds flute call for a long time but I think there are better options. I've just not spent the time required to master anything else.