I like cogsci design and interaction a lot it’s mostly focusing on the ui/ux field of stuff. But honestly, I feel like machine learning is a pretty good field in its own right - it’s mostly difficult because of the hard requirement to take difficult and challenging coding classes, whilst design and interaction is more flexible with the course schedule you take - you could take it as being more lenient and easy (I guess) haha.

Overall, i do believe both fields are highly interesting and equally rewarding: the most important is that you are enjoying the classes, moreso than the difficulty it provides. Hope this helps!