A Defensive warrior will want to go with Of Stamina first off
Warlock: Ah, my personal specialty. Defenitly go with "Of the Eagle" first. It’s got the intellect you need for mana and the stamina you need Last Chaos Gold to turn into more mana. Many different opinions here, but "Of Stamina" will benefit you too, as a close second.
Druid: A casting druid will want different things, it is up to you. A mix of both worlds I would say goes with "Of the Gorilla" for the strength and intellect. A Druid won’t have as much mana as say, a gnome mage. So the strength is more of a backup. If you're really playing like a caster, go all out and choose "Of Intellect" or "Of the Eagle"
Paladin: Plus Healing Spells. Period. If you're a casting paladin your job should be to heal the snot out of the flag carrier (if your co-operation is good) "Of the Gorilla" if you are not going to be casting many healing spells, and if YOU want to run the flag defenitly skip the noise and trek to "Of the Eagle" for the increased mana to protect you, and the increased health to help you along.
Warrior: Defensive: A Defensive warrior will want to go with "Of Stamina" first off, because a warrior with 1,000hp is hard for a "normal" BG player to kill by himself. so you'll win by scheme HP mass, along with your stun bandage or potion tactic.