I clicked through to this expecting it to be about Capistrano vs. Chef vs. [...], but the post is really about nginx vs. Apache vs. [...].<p>A more appropriate title might be, "Comparison of Rails Production Environments"
When it comes down to it for rails deployment your going to maximize the number of workers you have based on the amount of available memory. I'd like to see a test where they set the number of workers equal to the amount that fit within 512MB's of ram or something similar. I'd say using passenger + ree you'd be able to double or triple the number of workers for the same amount of memory and blow the rest of the stacks out of the water.
I've never heard ofr webroar before, but I'm not surprised that the people who wrote it can set it up better than they can set up passenger.<p>At least the bias is transparent, but I can't take benchmarks directly from the creator of any piece of software too seriously.