If a USB route matters, start there
Joy Xtra’s Quick Start documents a Bluetooth connection. Portrait 4’s current support page offers both a USB connection to a computer and Bluetooth. If you specifically want the option of a wired computer setup, that is a concrete reason to investigate Portrait before comparing smaller details.
That is a connection choice, not proof that either machine is more reliable. A buyer happy with the documented Bluetooth route has not automatically lost a useful feature; a buyer whose setup depends on USB should not hope that an unspecified data connection will appear later.
A phone does not automatically choose the brand
Cricut’s current Print Then Cut guide includes Design Space on desktop, iOS and Android. Silhouette Go also lists Portrait 4 and mobile Print & Cut. It is therefore misleading to reduce this comparison to “phone machine versus desktop machine”.
Your own SVG changes the software question
Silhouette Go’s current documentation says opening SVG files requires Designer Edition or above. It also points users to the desktop Studio program for more advanced design creation. That matters if your plan begins with your own SVG on a phone: sending a design, making the design and having the required software entitlement are distinct needs.
Before choosing Portrait for that route, identify where the design will be made and which edition supports the intended file. The USB option alone does not answer those questions.
A cutting machine is not the colour printer
Both workflows send the print to a separate printer before the cutter follows its registration system. If the project you imagine is a colour sticker sheet, the printer remains part of the setup you are choosing.
A good decision can be modest: Joy Xtra fits a planned Bluetooth/Design Space route; Portrait 4 deserves attention when its USB option and documented Studio/Go path fit your files. Neither needs an unsupported precision ranking or an uncertain width comparison to make its case.
Sources & further reading
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