Bearing in mind the current geopolitical situation of the world, is another factor the OP should seriously consider. In spite of setbacks like Covid and UK economic upheaval, the UK pilot and global job market ha been very healthy in recent years. This will not always be the case as it is a cyclical business plus extremely vulnerable to international shocks. Hiring feasts rapidly turn to famine with little warning, as they did during my career. Literally who knows what effect on aviation hires a serious spat in the middle east would cause. Again, looking backwards over 30y only BA have avoided serious job losses and most of those affected back in the 70,80 90's were later picked up if they wanted. Other brands are just footnotes in history, BCAL, BMI, Air Europe, Thom. Cook. Big today, gone tomorrow.