@krtrader This is very subjective and all depends on your usecase, for example PHP is easier to implement for webapps and JAVA is used for Android apps. As far as our client libraries are concerned it really doesn't matter since you can't compare both. Go with whichever you are comfortable with and suitable for your usecase.
If you are using live market data then it is better to use JAVA client since websockets API is not available in PHP client.