Which one do you think tends to have the higher ‘demand’ : ‘number of specialists in the market’ ratio currently and within the next 10 years?
There is no clear answer to this. Either one is in demand. All vfx artists are in demand. And will be within the next 10 years.
Just go in the direction that suits you best and interests YOU the most!
That’s true for most things in life btw You will only become good at something if you like donig it!