hmmmm! Well, I've read all of them. I can say that my favorites tend to be Spell Sword, Forbidden Tower, Hawkmistress, Heritage of Hastur, Sharra's Exile, Star of Danger, Sword of Aldones, The Bloody Sun, The Shattered Chain, Thendara House, The Winds of Darkover.

Ones I definitively did not care for were ones like Darkover Landfall, City of Sorcery, Two to Conquer, Planet Savers, Stormqueen, All of the newer ones that were co-written (exile's song, shadow matrix, traitor's sun, fall of neskaya, zandru's forge, flame in hali, etc).