Narrowed my choices down to 2. What's your opinion??

[Scavenger]

Whoops, thanks stretch, that should be 72" (six feet) Too many numbers in the head. But yes the tang issue you brought up. It's swimming and grazing room that are the issue correct?? If so, wouldn't being able to swim around the circle (so to speak) mean more swimming room?
That was one reason I thought the cube might work better, all the rock work in the middle and swimming room around the perimeter.

Thanks for your insight.