Dentistry will pay decent money, certainly similar to major airline FO. With some experience and your own practice it will allow you schedule flexibility and the ability to balance schedule and money. Won't work many weekends or holidays. Even more money if you specialize in something. Dentistry is pretty stable, there was a minor downturn during covid as people put off teeth cleaning, but if you need a root canal, you need it today.

Aviation *can* provide good money and schedule but it takes some time to get there. That timeline is compressed right now, but we are experiencing an unprecedented hiring wave... that will taper off some by the time you would apply to airlines. There's also potential industry turmoil... actually potential isn't a good word because it happens like clockwork about every ten years (war, economy, plague, terrorism, and probably something we haven't seen yet). Once you get some seniority (20-30% from the bottom at your career-destination airline) you should be safe from furlough, but might still take a paycut in a downturn.

If neither job is particularly exciting, I'd do dentistry and maybe buy a plane in a few years.