Startups face a number of large challenges and selecting the appropriate technology stack can play a large role in the success of any venture.
My hope is you have a technical lead on your team who can help with this process -- if not, I strongly suggest finding one. It's extremely difficult to start a company (in any industry) without any technical dna built into the fabric of the company.
When picking a stack or set of frameworks to solve the specific needs of your company I would look at two things: momentum and in house experience.
Refers to the trajectory that the framework/language/hardware/etc is on.