45 second 15% Balance versus 75 second 10% Balance ... which is more effective?

[Lyrica_Ashtine]

Rule of thumbs (that I use anyway):
Enhanced has a CD value of 0.5
Extended has a CD value of 1.0
Expanded has a CD value of 1~1.5

Enhanced adds 50% effect, but does not have the same effec tif you were to play two of the same cards
Extender doubles the duration, so it's basically the same as two cards in a row
Expanded has 200% efficiency (but takes 2 draws) if you hit all the DPS jobs with it. The rest would be a bonus (but not of the same value)

As for practical value, depends on the use and situation