What is your degree?
Ultimately, you want to be your own boss. However, there is value in working for a corporation and learning how business is done, how people are successfully managed or not, how the books are maintained, etc. Many successful businesses were spun off from larger entities. They adopted what the former employer did well and capitalized on the opportunities left unseized.
Another significant amount of new businesses emerge from side hustles of corporate employees. The regular paycheck is the R&D budget for their new ventures until they find a way to be profitable by themselves. You can work at the 70k level and learn the stuff you are interested in on the side. Most large companies will contribute to continuing education if it is somewhat related to their business.
The one thing you want to avoid is getting the 70k job and then spending all the money you earn plus money you don't have on toys. This will make you a permanent slave to the job and the bank.
The difference between the Kubota job and 70k is roughly 30k per year. That goes a long way if not blown on frills. Just looking at the financial side, I would take the 70k job, learn as much as I can there, max out my 401k contribution, live a frugal life, and save the excess funds for future business ideas or other investments.