Quote Originally Posted by Lord Magician
But know is Cloud, Barret and Vincent. I know...not much of a change! I only did that because tifa does strangely ONLY 300 DAMAGE CRITICAL HIT AT LEVEL 78! She has her best weapon and fair materia. WHAT THE $#@% IS WOUNG WITH HER!
I think this will answer your question.

Also, as with the other ultimate weapons, the Premium
Heart has a power up factor. The strength of the Premium Heart is directly
related to how full Tifa's limit bar is. This can be a bad thing at first, as
when her bar is empty, the attack power of the Premium Heart is virtually nil.
This fact alone makes some players prefer the God's Hand over the Premium Heart.
However, the Premium Heart does gain power very quickly, and about one third of
the way up the limit bar, its power will break even (meaning that from there on
up, it just keeps getting more and more powerful). One good thing is that this
always assures maximum power for Tifa's limit breaks. But, again, be prepared
for a quick and severe power drop immediately following.
As for characters...