I own a web design firm and most of the time for any development projects we use PHP and mysql

In recent projects one of my friend told me that ruby and rail is a very good platform and have a very professional community to support for any help needed.

I have php developers working for me but i am not sure if i should switch to ruby and rail

I have seen some very big websites are designed and developed in ruby and rail.

Is it very good as compared to Php and mysql and can it be install on any server like PHP> I do not want clients to spend money to buy some very expensive hosting later.

Also if it is too good than I will think of hiring ruby and rail developer.

I am mainly looking for long term solution so ready to switch if it is too good as compared to other solutions available