Regarding the design aspects of Alexa Dot it comes with volume buttons at the top and microphone initiation and mute button placed symmetrically. At the bottom equally spaced vents are provided. At the periphery consists power connector with an headphone jack beside it. With Google Home mini plastic with a mesh covered speaker and at the bottom we have button to mute the microphone with a USB connector
The price of Google Home Mini being $49 and that of Echo dot $50 with the echo dot having an audio jack that is not being available with Home. Voice support of Home is Google Assistant and that of Dot is Amazon Alexa. Home comes with 360-degree surround and dimension of Home and Dot being 40 mm and 15.2 mm respectively
Dot has been for long time compared to home so connectivity is a bit more for Dot even though Home too offers a good share of platforms. Some of them include Nest Learning Thermostat , power outlets, smart locks and more.
4) Artificial Intelligence
The AI technology of Google Home Mini is outstanding compared to Echo Dot.The questioning need not be repeated and context awareness is a excellent in Home than that of Dot. As AI technology and machine learning is more involved by Google compared to Amazon Home is a tough competition to Dot.
5) Audio Output
The Home speaker comes with a 360-degree surround speaker leading to a more clear and crisp sound. With a thumping bass and less treble compared to Dot its perfect for home, office etc. giving an augmented experience making it more user friendly with the 360-degree surround speaker not being available in Echo Dot.
Ultimately what to buy depends on the usage of an individual. But, most preferable being Home over Echo Dot as Home taking many features in a unique path be it in AI technology, Audio,Connectivity and other relevant specifications. So finally considering all the nuances Google Home Mini is a better choice.