So why doesn't Fortitude overwrite heroic bond?

[Kumoppi]

Isn't Fortitude the next line of hp ac buff? But it gives lower hp and lower ac than heroic bond? Am I missing something here?

[jerok88]

Fortitude is twice as long as heroic bond... which can be very useful in some situations

[Motec]

One is for buffing newbs while there is no spell restrictions so they have 2 hours of awesome buff, the other is the most efficient group heal you have and a far better buff to hand out to people you xp/raid with. I'll usually give charmed pets fort too so I know I'll never need to refresh.