For the 10 activities required on the common application, is it better to include a club that you have committed to for a long time, but don't have a leadership position? Or a club that you just started participating in Senior year with a leadership position(Precisely, secretary)?
In my humble opinion, I'd say the first one, because it shows commitment and lots of interest. If you can, also include the other one, but the first one seems more plausible to me. Good luck!
To keep this community safe and supportive: