An expert Ruby programmer can do wonders and be insanely productive, but I think there is a size from which it doesn't scale as nicely (both from a performance and a larger team perspective).
PHP's frameworks are fantastic and they hide a lot from an otherwise minefield of a language (though steadily improved over the years).
Both are decent choices if this is what you/your developers know.
An expert Ruby programmer can do wonders and be insanely productive, but I think there is a size from which it doesn't scale as nicely (both from a performance and a larger team perspective).
PHP's frameworks are fantastic and they hide a lot from an otherwise minefield of a language (though steadily improved over the years).
Both are decent choices if this is what you/your developers know.
But they wouldn't be my personal first choice.