if i had to pick i would get the added volume but only if you are going to fill it and run some coral to the top. I went a different direction and went wide (36") so i could have the depth and kept the height at 24". there are many ways to skin the cat, but really just go with what you like as there is no wrong answer.
having said that remember at 5'10" you will need to take your shirt off to clean the bottom section...lol
Wide tank always look better for aquascaping. It adds depth...