Unless you're very close to full retirement (age), the career growth is likely to be the far better choice both commercially and emotionally. No point earning

Unless you're very close to full retirement (age), the career growth is likely to be the far better choice both commercially and emotionally. No point earning an extra $50,000 per year if you burnout in 2 years and have to live off savings for a couple of years while you pull yourself back together. More importantly, I live by the phrase "Income follows Assets". Think about property, think about product development, and think about your own personal skills and energy as your assets. Career growth is an investment in your personal asset base - much like buying a house to rent out or coding a new product, there will be an investment (in this case, both time and lost revenue) and it sounds like there will be a return on investment (income following your new assets) in time.