60x30x24 would be a lot easier to work with. The other size would be very difficult to reach anywhere near the back of the tank. Actually any tank over 18" in depth is hard to reach to the back and see what you are doing.
my largest tank currently is 72" bowfront 175g, 27" deep, and i have had to become pretty adept with the 'pincers' although 36" deep would look cool, i thought it would be just abit too far to reach
