in the plus column:
Quartet for the End of Time -- one of the best things I've ever heard
Vingt Regards Sur L'enfant Jesus -- awesome!
L'Alouette Lulu from Catalogue d'oiseaux -- fairly awesome
Theme and variations for violin and piano -- fantastic!
Et exspecto resurrectionem mortuorum -- really liked this
In the minus column:
La Transfiguration de Notre Seigneur Jésus-Christ -- found it quite tedius and hard to follow
Harawi -- not a nice sound at all
I doubt that there's any kind of common thread among my likes and dislikes.
There's one very clear thread, which is that those you like are instrumental and those you don't both have voices!
I think you would certainly like the
Turangalîla-Symphonie and you would probably like
Des canyons aux étoiles... which is my personal favourite as I'm always saying,
Couleurs de la cité céleste, Sept Haïkaï, Concert á quatre, Visions de l'amen and the rest of
Catalogue d'Oiseaux. My experience with
Transfiguration was that when I first heard it, when the Decca double LP came out, whenever that was, it seemed to consist of some beautiful moments t which I had to fight my way through a lot of turgid stuff to get to. However it grew on me in the course of time and I now almost regret that it isn't even longer than it is. Nevertheless if I were pushed I'd probably say I preferred his instrumental pieces to the vocal ones too, maybe because all of his music is trying to gain access to something for which words are inadequate.
Once you get through all those you might like also to have a go at his organ music. For many years the only organ piece of his I had time for was the
Méditations... but more recently I realise I was missing out on a great deal, particularly the two most "abstract" pieces
Livre d'orgue and
Messe de la Pentecôte.