I was in your same position. Went waterbox due to the imperial sizing on the plumbing, the plumbed manifold and the fact that their stand doesn't sag (well "yet") and that the finish of it is completely coated where i hear the RS isn't. Also, all plywood stands and that's not the case for the smaller RS tanks, they are MDF. We all know the only thing that soaks up water better than a bounty towel is MDF board.
Easy decision for me......and now that i have the tank, I couldn't be happier. ALTHOUGH, I bought the peninsula and didn't know they electrical side only opened up on one side of the tank........had to improvise there. Wish that was better called out.