Does Wisdom give more mana per level as a Druid?

[VincentVolaju]

I have a level 15 Druid atm and I am using a Scepter of Flame mace, which has +15 mana on it, then traded it for a weapon with +5 Wisdom on it. Both weapons gave me +15 mana, but I am wondering as I level will I gain more mana from the +5 Wisdom, or is how much mana you get per wisdom point always the same?

And if that is how it is, then is it better to twink gear with +Hp/Mana then it is to twink gear with +Wisdom?