Two different animals so to me there's no way to say which is better.
I use my pellet spitter for pork ribs and other meats that don't require a strong smoke flavor imparted into them, and that's the complaint mostly heard about them, lack of smoke flavor.
I have the Masterbuilt and it's strong point (along with steady as a rock temp control) is that you can impart lots of real wood smoke flavor into the meat.
So, brisket and beef in general tastes much better on the Masterbuilt than the pellet burner.
Keep in mind that I and some others love wood smoke flavored meat while others do not, so judge your choice with that in mind.
I use my pellet spitter for pork ribs and other meats that don't require a strong smoke flavor imparted into them, and that's the complaint mostly heard about them, lack of smoke flavor.
I have the Masterbuilt and it's strong point (along with steady as a rock temp control) is that you can impart lots of real wood smoke flavor into the meat.
So, brisket and beef in general tastes much better on the Masterbuilt than the pellet burner.
Keep in mind that I and some others love wood smoke flavored meat while others do not, so judge your choice with that in mind.