Aquascaping: Long and Shallow Tank or Lagoon

[joshharvey02]

I'm about to order a new tank
Trying to decide the best size for scaping a display that can house the most corals and the largest fish.
I am upstairs so can't have more than 125 litres in the display.
Dimension options are either: 120x30x30 ( cm ) or 75x50x30 ( cm )
Interested on thoughts of which would be the better tank as far as space to aquascape around housing the most corals and the largest fish!

 

[Streetlamp]

The 75*50 give you a greater area to play with so that would be my choice. 3600cm2 vs 3750cm2

 

[dbraun15]

I agree...wider the better...especially for scaping options.

 

[Jon Fishman]

Longer for fish though.....

I love my long skinny tank, but would absolutely go wider if I could, but not at the cost of losing length