[nudge]

I really don't think there are any very convincing reasons, if you are competent already with php+frameworks.

Perhaps Heroku for easy deployment? I haven't used it myself but I gather it makes life easy.

The question to ask yourself is whether you find yourself doing things you feel you shouldn't have to do, whether that's repeating yourself or creating functionality that should already be built in or available as an addon. If you are happy with what you have, it doesn't matter what everybody else is doing.

It only really matters if there is something discontinuously advantageous in switching, for scaling reasons perhaps. But for now, I'd say your own existing expertise in php would more than outweigh any advantages of switching.