Hi, so in terms of good salary, Artificial Intelligence is definitely going to grab you your dream package. Since, Machine Learning, Data Science etc are the sub topic of Artificial Inteligence. And technically artificial intelligence is also a part of software engineering.

Artificial Intelligence is very vast and is a great carrier option. Also of big companies are working on it and alot of them use it in their systems.

IOT is also a great carrier option but for a Artificial Intelligence engineer IOT should not be a great deal of work. Since it is not as vast as AI.

Hope this is helpful.