I haven't worked with Joomla Framework or Laravel. In my view, Laravel and Joomla Framework offer a modern PHP architecture and they really shine in that area. But, they don't have a rich CMS or stable extensions to start working right away. So, you are on your own to build everything. I would only follow this path to integrate other systems or if I'm ready to be committed with a project in the long term.
PD: This saturday, I'm attending to Joomla Day UK - 2016 and there are several sessions related with frameworks (George Wilson) and Joomla Future (Chris Davenport). I'll be reporting back!