I've owned the BDB and a Mini Vivaldi (for steam it is the same as the dream T I believe). What Breville has done is that they have configured their steam system to be able to produce excellent microfoam. What I mean by that is that although it is not powerful, it IS effective and easy to learn.
The Mini Vivaldi on the other hand has very strong steam and IMHO there is a learning curve to managing it to get excellent microfoam especially if you are steaming 5 ounces and less. But once you have learned you can then produce excellent microfoam.
I've used both and have been able to produce quality microfoam on both, but they do feel different in use.
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