Welcome to the board!
To be perfectly honest, if you are asking differences-- you possibly *may* not want to get one just yet. You may wish to research, meet dogs, etc a bit more before settling. These are not only not dogs for a beginner.. they are not even dogs for experienced "pet folks". Here's why:
The most extreme Mals and Dutchies are insanely hyperactive, attention span of a gnat, nervous-nervous-nervous, bite because something moved/breathed/hiccuped, can't sit still, fall apart during traumatic events such as thunderstorms and you using the blender in the kitchen, bite the meter reader/your fave guest/ the vet/ Aunt Edna because they zigged when the dog thought they should have zagged, and have very obvious nervous breakdowns when an owner tries to do something foreign to these dogs, like, relax.
Less extreme Mals and Dutchies do exist. They are wonderful dogs for people who have a gargantuan amount of involvement with their dogs and a very suportive dogsport club to provide outlets and assistance with such bright but challenging breeds. Still-- not a dog for a casual pet owner, even one curious about dogsports.. this is a dog to research, meet, and meet again and again.. learn how people live with them.. and then make your choice if this is for you. Best bet if a beginner to these breeds is determined: Breed rescue, perhaps a middle aged adult to selected to fit your activity level, lifestyle, level of expertise.
The differences between these breeds are small. The Dutchie has brindled stripes, the Mal has a fawn coat usually, with a black facial mask. Both are, in theory, equally trainable-- provided you find a dogsport club with experience. Pet type trainers will not know how to handle these super-intelligent, oftentimes insanely driven, dogs who are now bred mainly for sport and all the exaggeration of temperament, drives, impulse control (or lack thereof) that creates the spectacular flash-and-dash on the field.
Again, for your very first Dutchie or Mal, yu may wish to go through breed rescue and find a middle-aged adult. Or, throw caution to the wind-- find a puppy, and get a whopping huge amount of support from a dogsport club.. or two. Regardless, these are breeds needing research done in person, meeting the dogs often on a regular basis... not just a visit to a breeder's.
Good luck! These are smart dogs, and very beautiful. The most mellow of them are still more high octane than one might expect.