So, for context, a round is supposed to be 6 seconds.
10 rounds is equal to a minute
If a 4th level Bard casts the standard 'Invisibility' spell, it would last for 10 rounds per level (40 rounds).
If the same bard casts the 'Greater' version of the spell, it would only last for 4 rounds.
When the only trade off, in the latter scenario, is that you can attack, is this really a decent trade off? Or is it merely a case of situations calling for a specific spell?
Invisibility is pretty much for scouting and hiding. It turns off when you attack someone (and the spell defines what an attack means for this purpose.)
If you want to attack somebody, and not have them be able to tell immediately who did it (because you are invisible), you will need greater invisibility. This is very, very useful, but you shouldn't use it just for sneaking into a manor or hiding from the guards (that's what invisibility is for).
Not entirely sure how this is a rules question,, but your interpretation seems correct. "Short duration" is one way the game uses to keep more powerful effects manageable, and greater invisibility is one of the biggest examples of this.
If a 4th level Bard casts the standard 'Invisibility' spell, it would last for 10 rounds per level (40 rounds).
If the same bard casts the 'Greater' version of the spell, it would only last for 4 rounds.
Greater invisibility is a 4th level spell for a bard, so she'd need to be at least level 10 to cast it. And it would last 10 rounds. Just saying.
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Invisibility is great for scouting, getting into position, and getting that solid first hit. Greater invisibility, which bards don't get until 10th level, is great for dealing damage and keeping someone sage. Especially for classes with sheesh attack. Greater invis has allowed my Arcanist to do hit and run tactics. Cast attack spell and then stealth to a new position. Two weapon rogues at 10th level can deal out a large amount of damage while greater invised.
So, it is situational. You generally won't use invisibility and greater for the same reason. Invosobilty is more out of combat while greater is in combat.