I, too, don't believe that a churchwarden produces a "cooler smoke". It seems like many of those who make this claim are, in fact, merely looking for a prop to go with their hobbit (or in this case wizard) motif.
And that's fine. Have fun with it.
But if you're more interested in taking up the pipe (rather than just using it as a prop), I recommend you buy the best pipe and tobacco you can afford. Try as many blends as you can, take a lot of notes, and slow down. Personally I'm not partial to cobs but opinions vary. Keep reading, stay curious and I'm sure you'll find what you're looking for.