Generally, more hard-sciencey type fields tend to have better funding (physics, engineering that sort of thing). They also have less PhD students, because there are more opportunities in industry so less competition for places.

It seems like CS is one of those disciplines also, tbh.

I mean, PhD's are great if you want to learn how to structure and finish a long-term project, and learn how to research. I definitely don't regret mine, but I remember looking the the cost structure of masters vs PhD's and concluding that masters were for suckers as you could always just finish a PhD in 18 months with a research masters.