90 vs 91

[ThunderAeroI]

You have a simple choice, select between 90 or 91. Provide a reason for your choice if you like.

 

[StarMan]

I've spent ten minutes pondering this question and it's significance. And the one thing I've discovered is...

... I'm never getting those ten minutes back.

42.

 

[Australis]

The real answer is 47.

 

[Locutus of Bored]