Which tank dimensions are better?

[madreefer11]

Trying to decide between these two tanks

100x30x30
Or
100x35x21 cm

 

[Euphyllia97]

Would go for the wider one :) Horizontal space is more important than vertical. Also easier to build nice rockwork and still keep separation from the glass

 

[slingfox]

I would prefer the second set of dimensions since I like shallow but wide