Let's cut to the chase. If you're looking at the top programs, the real question they're asking is "are you a successful person? have you proven that you have what it takes to continue to be successful? would our investment into your education help you achieve further success?" This is the real reason that success begets more success; like an escalator.
As such, when people say "do what you're passionate about," they mean to say that you're more likely to be successful in something you care about rather than something you're doing to try to simply fit the mold of what you think someone else may be looking for. It's also why you will find all sorts of different people at a T5 program who got there via all sorts of different paths, aka not all just publishing in Nature (although there will be some of those). The one common theme amongst the students in those diverse classes however, is that they had a vision of what they wanted to achieve in life, followed that vision with intent, taking advantage of the opportunities they had available to them, and EXCELLED at it. If you look at their CV and their personal narratives, it tells a completely convincing story of exactly how they ended up where they ended up, and also where they're headed. It is a story of: "yes. this person is a successful person. you put them in any setting, they will continue to be a successful person. they demonstrated their focus, work ethic, intelligence, morality, etc etc etc via their track record." At that point, the T5 school will then ask "will this person benefit from being at our institution? can we help them further their journey towards their ultimate goal?"
So to answer OP's original question of basic vs clinical research; doesn't really matter 😛