> While I agree that Google's pricing model is superior, the author's position on reserved instances accounts for ~40% of the cost difference.
Author here :D
Gotta take a stance to draw graphs, right? Comparing no reserved instance with the automatic discount is simple and realistic in my experience.
I could make pricing graphs accounting for 25% of AWS reservations and 75% of automatic google discount. In my experience, that's the proportions we _may_ have in practise. It would still be the same conclusion. Google is massively cheaper.
I could make TCO pricing graphs, accounting for the thing from the last paragraph, plus the human time (500$/day) required to understand, pick and manage reservations. I didn't do all the computations but so far it points towards a negative ROI (compared to not reserving), unless the infrastructure is big enough to have the economy of scale (hundreds thousands dollar per year). (Note: I really don't want to go against all the HN/reddit crowd who drank the reservations marketing koolaid, so purposefully avoid to talk about the TCO pricing model publicly ^^).
Thus, in all scenarios, google instances are massively cheaper. YMMV.