This is actually a really good question. The oaths/oathbreaker mechanic are fairly wonky in EA, and were a large topic of discussion when patch 9 launched.
Since alignment is less significant in D&D 5e, paladins would generally be tied more closely to the tenets of their oaths and any particular alignment. The best example I can give is an Oath of the Ancients Paladin could be more aggressive (leaning more neutral than good) as long as they were protecting nature, while a Redemption paladin would/should be slow to attack even when facing evil (the thought being everyone has a last chance at redemption). I didn't play a paladin myself but the general consensus was most people mistakenly became oathbreakers with limited consistency on the reasoning.
Now that I think about it I'm surprised questions about the oaths have really died down as we got closer to launch.
