Very good comparison. They do look a lot alike, except the Westie's are a lot heavier and built with more muscle. You can play rougher with a Westie.
I saw that they (westie) were ranked as one of the top owned dogs in the U.K. along with the cavalier and 1 or 2 others. Westie's tend to snap more with young children (who do not know how to handle them correctly), so that's why I chose a Maltese.
Maltese usually have hair all the way down to their feet much like the dogs I said I wanted on the thread below (old english sheep dog, bearded collie, havanese, etc). It's just not practical to take care of though right now, so I clip her hair.
Grand Duke, are you married? Just wondering if you plan on maybe moving to a house or something in the future where you can have your lab.