The personal story has zero impact on the story as a whole. I'm very disappointed with the home instance and the personal story bit they tried to create. It's all rather irrelevant. The most you get is a few different quests based on your choices, but none of that matters in the end, and your home instance is pretty pointless.
It is a capital mistake to theorize before one has data. ...one begins to twist facts to suit theories.... Sir Arthur Conan Doyle
All of the races have a bit of a unique story in the beginning, but by level 30 it becomes the dragons have returned and we must stop them for all the races. So yeah, your choice doesn't really matter.