My favorites (and I've tried them all) in order (all are Isolate):
1. AlltheWhey Cupcake Batter
2. GFPro or IPro Cherry Blast
3. AlltheWhey Eggnog (seasonal)
4. GFPro or IPro Orange Creamsicle
5. AlltheWhey Cinnamon Bun
These are the only brands/flavors I buy anymore cuz nothing else come close. They may cost a little more than concentrates, but for me its worth it.