I would choose company A

Offers higher salary and more work experience, the work load and extended time will be well seen in future jobs.
You can have the satisfaction of finally having the job in the company that you have wanted so much.
Considers that being salaried implies depending on the fluctuations of the market and how they affect the companies for which we work. In this sense, your most important long-term resource is your experience which is the only one that will increase your chances of obtaining a better job later or of getting another quickly in the event of the failure of these possible employers.
Have more time in the market ensures a longer survival time in it so at least one year from now you could consider it as safe, a year that you can get involved in this battle against multi-million dollar debts, which It could be more useful than ideal conditions that do not generate any learning.
Many times we prefer our comfort sim understand that success requires sacrifice.
I really hope that you select company A.
for you, for your professional development and for your possible success later as an entrepreneur.
Thank you for including us in this important decision in your life