A rather useless question. The word "prefer" is much too vague.
I'd be rather interested in how much experience people actually have with these languages and whether they plan to continue using that language in future projects.
The popularity of a language is important. If developers don't like a language they won't use it. Look at Ruby a few years ago as an example of a popular language which was hardly used which became on of the most widely used scripting languages in modern times.
I'm not sure though whether "prefer" (prefer for or as what?) actually measures popularity ... but what kind of popularity anyway? Fanboy-fellowship? People actually using it for work that earns them a living? Hearsay/gossip?
With respect to your ruby example, I have been using ruby for about 10 years but stopped doing so a few years ago. So please excuse me if I fail to see your point. :-)
Commonly used and popular are not the same thing. I happen to know a number of developers who hate Java, but code in Java for a living. By popular I mean number of developers who actually enjoy using the language. There are better ways to measure usage e.g. job ads on indeed.com.
I'd be rather interested in how much experience people actually have with these languages and whether they plan to continue using that language in future projects.