I considered both of those racks and do have the AP 570 combo rack, 4 shelves, but wound up going with a CSerpents V70 rack instead. I ordered in time for an expo pickup, so I got the enclosed 5 shelf one, and it is fantastic.

I think the CSerpents is a pretty good combo of the two with a fair price, especially if you can swing an expo to pickup yourself to skip shipping. Fairly nice and sleek design with a way to stack if you expand for more. It lacks the rounded edges of my AP, but shelves don't stick out past the walls at all which makes that no big deal. Expo pickups are all assembled racks and most smaller ones are shipped that way as well, if I remember right this includes the 3 shelf V70. Included the tubs in the price on the site. It is 3" heat tape but it seems to heat a solid 8-9" area in the back to 88-91 which is enough for me (and 4" heat isn't really much bigger; not worth an upgrade unless it is 6" tape or bigger in my opinion).

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