Default [Q] Advantages / Cons to Samsung & Google TTS Engines..

Good evening

Simple question, which of the two engines (Google's own or Samsung's) is better as an all-rounder? And why? I've been trying them both out (mainly for GPS navigation and for the Briefing app on my SGS4) I can't really tell which one to stick to, as I'd like to scrap the other if possible..

Thank you