This may be nitpicky and please let me know if it is but I always considered the Taiji era songs to be old X Japan songs or to be technical the pre Vanishing Vision songs. Art Of Life is my personal favorite X song to be clear.
The PRE-Vanishing Vision songs? You mean post, don't you?
For me, the Taiji era concerts (namely Verge, of destruction) are the ones I enjoy watching most, because they were just such a great Live band. But, as far my favorite songs go, it's like 50/50 Taiji/post-Taiji era.
Still, what a bass player *sigh*