First of all, there are no breeds in the bird world, only species. A breed is created by humans who breed selectively to create a whole new type of dog, for example, but birds are categorized by different species and they occur naturally in the wild. It's a common mistake, but I thought I should point it out.

Some birds talk better than others. Lovebirds and cockatiels can't really learn to talk well, because it's physically difficult for them. But cockatiels are excellent whistlers, so they make up for it! A male English budgie currently holds the world record for the largest avian vocabulary, but African Greys, some macaws, and Amazons are better known for their talking ability.
I read somewhere that birds actually learn words better from other birds! This is probably because our voices are a lot different from theirs, so it makes sense that a squeaky-voiced budgie would find it easier to learn from another squeaky-voiced budgie, rather than a man with a deep bass.