What are the advantages and disadvantages of each version of Azura's Star?
I am starting
The Black Star Quest and I see that the reward is a
Broken Azura's Star.
Bringing it to Aranea Ienith makes it Azura's Star that can capture only creature souls. Instead, bringing it to Nelacar makes it The Black Star that can only capture black souls i.e human souls that are always Grand. (Are there other type of black souls?)
From my search I see that, black soul gems are not rare but I have played Skyrim for a few hours (reached Level 30) and still found just one! Where as Grand soul gems are easier to find but very hard to fill with 'grand souls'.
At first glance The Black Star sounds much better as there are a lot of humans, like bandits, available to full it with. In comparison, to fill Azura's Star one doesnt need to go looking for humans to kill, also morally good, as there are all kinds of creatures available to slay specially during fights.
Interestingly, if one goes for The Black Star then we dont get the option to have Aranea Ienith as a follower.
Overall, it seems like that Azura's Star is better for recharging stuff and The Black Star for enchanting.
My question is, which choice is better in the long run?