Does anyone know of a site, blog, etc. that constantly updates a comparison between the various ArcGIS APIs for each new release of the API?
I think that was the intention of the ArcGIS Web APIs: What are the differences? entry in the community wiki. It's probably time to update it.
I had the same question today and came to realize that there is a bit of information dating back to 2011 but not a lot recently, as of March 2013. This is a sort of question that will get readdressed as the technology progresses. Here is what I have found today:
Although the sample size and the methods to calculate the statistics can be arguable.
There is also this discussion in this group:
which was closed as was not constructive by the moderator. I am very much interested in seeing any statistics (something like a matrix of number of sites developed versus number of visits to them) regarding the use of each API. I imagine that would be like waiting for it to snow on a summer day...