Breville Dual Boiler and Rocket Appartamento are both labelled as powerful espresso machines while each having its specific set of features, size, build quality, and overall experience that can be very different. Breville Dual Boiler is larger, it has a consumer level build out with more plastic parts dominating, and many programmable features such as temperature control, pre-infusion, and a Digital screen. It’s built to make life easier and to be consistent on many different levels. In contrast, Rocket Appartamento is built more on a compact architecture which is traditional in that it has an all stainless steel body and better build quality but has an experience that requires more of manual interaction and less of programmable features. The Appartamento also has a no-burn steam arm and is more space efficient in nature. Ultimately, it comes down on whether you want ease of some technology or manual experience of high engagement and quality.