Good question. They are very different so I would recommend doing prep courses for both to try it out.
However, then decide which specialty you're most interested in and go for those technical interviews.
In preparation, definitely complete the prep course. The next steps for you should be to ask the admissions officer about the type of questions that are going to be on the technical interviews.
What resources do they recommend you review to get accepted?
What they think will be enough preparation to get accepted?
Finally, reach out to someone else on CK who is attending that bootcamp or join a squad and ask our community.
Does that help?