Here is a comparative table between Amazon Echo Plus and Amazon Echo Sub. The speaker of the second product (Amazon Echo Sub) is more powerful than that of the first. Amazon Echo Sub is more cumbersome than Amazon Echo Plus. The second product appears to be heavier than the first. Amazon Echo Plus is priced higher than Amazon Echo Sub. The two products are based on the same artificial intelligence software (Alexa). Let's go into detail with the technical data between Amazon Echo Plus and Amazon Echo Sub. Published data is always indicative and may contain errors or be subject to change. Always check official sources.