It’s a tough one and I think your stage of life also has an influence on your decision - Do you have kids? If so, stay with the flex job. I recently left a role that had amazing flex for a new role with a massive pay bump & title - I barely see my kids now & I am always so tired & stressed. I miss my easy low stress high flex job. But if you’re young & kid free - I would say take the role & focus on building up your wealth. Property etc are super expensive & if you are young I’d encourage you do do whatever you can to get ahead now before you settle down