This is kind of an easy decision.
GNOME Screenshot manages capturing screen-scrapes. However GNOME have replaced gnome-screenshot with their own inbuilt mechanism - so I would expect GNOME to place the app into read-only archive mode i.e. mothball it soonish.
Team member Jacob and myself have created budgie-screenshot which is part of budgie-desktop itself and has been submitted upstream. This will replace GNOME Screenshot in budgie-desktop 10.7 i.e. GNOME Screenshot will be dropped as a default app install.