Depends witch ray you plan to get. Both can hold ray as big as a 3' and 2.5' motoro in a 3' deep tank. personally I would go with the 6'x4'x2'. Either way they both 24 sq. Feet.
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i always like that wider more than 30" ,for longer way to swim for turn around 3' is ok for turn around too not comfy as 4' but i'm sure they can lift tail up abit for turn around when they get adult
build an indoor pond.. my husband isnt into fish like i am.. but if i can show a $$$ way of realistically affording things hes on board. and just saying.. i had a fiance who wanted nothing to do with my interests... i met my husband a few monthes after i left him.