For now I can tell you AI is the future and BTech in Artificial Intelligence will definitely be an in demand branch, with strong career scope and placement prospects. However, the bitter truth is Placements are highly influenced by your University. Try getting into atleast a NIRF Top 100 Engineering College, and youll probably end with strong Placements. As far as affordability is concerned, it again depends on your College, whether its a Government, State, Private University and fees may vary accordingly.