Just went to the Alessi site for more details. List one for £160 and one for £170. No obvious difference. Click on "what is the capacity of the toru kettle" and it makes you wait for an ai to answer the question.

What am I supposed to infer about the quality of a design company when they can't even get such simple things right?

Well, if it looks cool and it nearly works that is totally on brand for Alessi!

They're different sizes, it's in the description and it's also described under "More info" > "Capacity (cl)". I'm not seeing the "What is the capacity..." button you mentioned.