Finally, I've made up my mind and voted for Aoi Yoru.
Even though I thinkg both lives go pretty well together, the blue night is still my favorite.
And here are the reasons: *WARNING SPOILERS*
1) The opening. X and Joker as openers is simply great. It jsut rocks from the first seconds.
2) Standing Sex: hide is giving us attitude and it'S really scary
3) Heath Solo: Even though both soli are quite long, this one is a bit better in imho
4) YOSHIKI piano solo: It goes a bit more smoothly, not too much impro...he starts es-dur no piano sen very quickly and the right light-mad part is pretty awesome, cause it so much reminds me of Art of Life
5) Celebration: Just gotta love this one. hide is just funny and overall this song is among my fav's
6) Orgasm: They are headbanging!!!!
The only thing that's missing and the only reason that made it so difficult for me to make up my mind and make a decision is the fact, that they didn't come out again after Longing. If the had done that, I guess Aoi Yoru would have been my fav right from the start.