I'd be thrilled to have you as a customer, and very happy to answer any questions you have about the Pegasus product, community, etc.
Almost all of the popular boilerplates mentioned here have been created by individuals who are passionate about their frameworks (in my case Django) and have significant experience building products on top of them (in my case 10+ years). Many of us - including myself - are now full time on our products. So you're getting hundreds of hours of work "done for you", plus a steady stream of updates for the cost of what would typically amount to a few hours of our time as a freelancer. But I guess you're already sold on the idea of a boilerplate.
Anyway... my point is, you can't really go wrong as long as you pick one that's backed by someone who is a) experienced, and b) committed. And that's true of myself, Kyle (Gravity), Gabe (DivJoy), Andrew (Bullet Train), Chris (Jumpstart), etc.
You said you're open to the language, but in all honesty I'd say that's the most important decision criteria. Django and Rails and to some extent Laravel are comparable - mature frameworks with lots of batteries included, mostly server-render HTML by default. JavaScript is its own separate beast with a more fractured ecosystem, but tighter integration with the front end. I'm obviously biased towards Python because it's a wonderful language to work with and has a great community and third-party package ecosystem. But honestly, any of these are great choices and will help you launch your first product way faster.
Good luck!