Both devices function as a 4G home broadband router, with the AI Cube B900 also having a built-in Amazon Alexa smart speaker. With the AI Cube, you’ll lose out on external antenna support which is often useful for improving coverage and download speeds. You’ll also get fewer Ethernet sockets and slower maximum upload speeds. For many people, a better option will be getting a Huawei B535 for £20/month and pairing this with a standalone Amazon Echo speaker.