Black souls are for humans. The white star cannot hold human souls. --- "Cid is badass. He's old and still crackin'. He can fight underwater with a lit cigarette in his mouth. He drinks the goddamn tea." -Gaming_Mastery
Black star is the best but with the white one, you get a pretty powerful follower if you so choose. --- i5 2500k @ 4.5 | P8P68z Pro |Corsair H80 | 8GB 1600 | GTX 580 3GB | 60GB + 120GB ssd | 3TB hdd space | Win 7 64bit | corsair ax1200w psu | BD burner | cm690II
Black one can only hold human souls, which are always grand sized. The other star can hold any soul, and if it's empty and you don't have any empty soul gems and kill something with a lower than grand soul, it will go into the star.
So, the black star will ALWAYS have a grand soul in it. With the other it's possible that it will be smaller.
I got the black star, and keep a bunch of lower level soul gems in my inventory for smaller souls to go into so they aren't wasted. --- http://i43.tinypic.com/zydphc.jpg
THE BLACK STAR WILL CAN AND WILL ABSORB WEAKER SOULS!!!
it's evidently not supposed to, but it absolutely does.
it is still the better choice because it CAN absorb human souls, you just have to make sure that the first thing you absorb once it's empty is a human soul. but you don't even have this option with the regular star. --- without God, death is the only absolute