This is a pretty common question. Before Lord of the Rings and Gandalf the Great was popularized, Sherlock Holmes, the British detective had the market on long stem herb pipes.
But as time marches on, so do product icons. Gandalf pipes are now way more popular than Sherlock pipes. The difference between the two hand pipes is probably stem. The stem of the Gandolf is much longer. The size of the bowl may also be different on some pipes as well.
If you are ready to get down like Gandalf and blaze some middle-Earth herb, this is definitely the pipe for you.