pretty much what eva float ur boat, mate. i would prefer teh latter on due to teh hight. but thats just me.
both are good but it also depends what you want to put into ur tank. if your gonna have tall plants get the taller tank. if smaller. get the smaller tank. if both still get the taller tank so as you wont have to trimm ur plants as often. what one looks better?
sky is the limit.
i hope this has helped.
regards, communtiy
P.S. you also might want to take into account how much light the desired plants will need.
if they are plants that require bright lighting then i suggest you get a stronger light.
the higher the tank is, the deeper it is, the more the light rays, beams, whateva have to travel to reach the bottom of your tank.
although i dout 3 or 4 inches in depth will make much of a difference, but hay you neva know.
