Dear,

Let’s first understand these terms.

1. AI is like root of ML(Machine Learning), DL(Deep Learning).
2. ML is the sub part of AI.
3. DL is the sub part of ML.
4. Data Science is neither fully cover AI nor it is AI, It is the part of AI.

Now a days many company(both product and service based) are looking for different-different profile of people. It is like you cannot say I know only ML or DL or Data Science, You have to have some knowledge of all the fields and the core knowledge of the main field which you have been hired for. So, from above answer it is clear that all fields which you mentioned there have better career.

At you own interest choose any of the field. All fields have equal opportunity. I suggest you to attend plenary sessions , read research papers and try predicting what the future demands maybe and you could invent the next curve breaking product or prepare for what the future career options may hold.

Hope this helps!