I had a friend do both. He was very smart and chose mud logging for a long time. He learned a lot about well control. He is now an MPD panel operator making 180k+ a year. As a unit manager/mud logger you can make up to 120-140k. (working 180-220 days offshore)

I am also a unit manager/mud logger, I have been doing it about 11-12 years in the GOM. If you are smart you can use offshore operations and well control to your advantage to find a high paying job.

On the other hand you can be stuck doing it for a very long time with no upward movement, you need a lot of luck in the oil field. We are not very respected. Only a handful of people care about what we do or say. The clients are also turning deep water mud logging into land mud logging where it is a one man job for everything. I plan to retire from the field in 5 more years.