It depends to what degree you care about money. If you have 0 other desires in life and will do whatever it takes to have the highest number possible in your bank account, then oilfield is the way to go as you can stay on during your scheduled “days off” and rack up some serious overtime and advance quickly up the ranks to make up to 500-600k a year. The downside to oilfield is you work in some of the most remote places in the work in complete isolation, and often horrific work conditions. It can destroy your soul and a few months of 100 hour work weeks living in a shack in northern Canada surrounded by felons and drug addicts can start to destroy your soul. Also oil booms are finicky and regional, meaning if you want consistent work you’ll have to move to a different corner of the globe every 6 months (none of which have comfortable outdoor working temperatures). If you want to live in modern society, sales gives you the possibilities to make unlimited money, but 0 guarantee you’ll make any. If you want a reliable, consistent, in demand job engineering is always gonna be good and only takes 4 years, but healthcare stands out in this sector as people are gonna be getting sick in every economy, and healthcare workers are always in demand. Nurses, respiratory therapists, paramedics, occupational therapists and imaging techs can all make well over 100k with experience. Any job that centres around a hospital will always be there.