Draper Gem or explicitly use Decorators and Presenters?

Hi, my question is simple that sometimes I have to extend my model with methods that are usually for more advance business logics and sometimes I need some methods that are used in views (not specifically helpers), I believe the former can be named as decoraters and latter can be called as presenters. However, I know there's a gem named draper which has examples of only I GUESS the presenters, even tho its naming convention follows Decorators, but I need advice or ensure if I could use the same gem to make both decorators as well as presenters objects.

Because I am always confused if I have to create another presenters directory in my app folder and write presenters there or just do it in the existing decorators directory (from draper gem).