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All in all it probably won't make much difference either way except that you'd be able to manage the app description, permissions, etc but it's possible it could be a pain in the ass for them later on if they need to change something like a permission or whatever the case may be
Depending on how they're doing and what the app actually does you will at the very least need to give the app id that is generated when you register the app with facebook which in some cases is public anyway.
Giving the app secret would give them more options to mess with things..
Of course if you want to really stretch your imagination their could be downsides to allowing them to develop for an app you registered, if they had your app secret they could technically do something that violates terms and it would be on behalf of an app you generated in which case you could be penalized for it
That is all hypothetical and theoretical. Overall I doubt it matters and might be an equal or larger pain in the ass if they end up having to change things
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