New guy here

Hi there.  I’ve been using a pp2 for just over a year and am looking to get some tips.  I’m looking to get a better polish and also getting a nice tip.  I seem to always round them.  I’m also using the 1200/1600 and super fine ceramics.  Seems like I’m headed towards getting the tapes but don’t know if I should go the diamond route or getting the aluminum oxide tapes.  If anyone could point me in the right direction I would appreciate it, thanks.