I would say depends on what your goals are. Is this a personal project and do you want to make money with it or is this something that you are doing for learning as part of your career.
If you want to make money on the project and want to get it out as fast as possible Go with laravel. You already know the stack and will be productive in it. You might also be able to reuse parts of the code thats already written or put it in the right place.
On the other hand if you want to learn another programming language or want to go outside of your comfort zone then give Ruby on Rails a shot. Not sure about Laravel but for a small to medium website, ruby does make adding a lot of features much faster via its gems.