Well it all comes down to individual opinions but I'll give you mine..
I house my adult female in a 32 qt tub and she does fine. She's 2500 grams. I also just finished building a 32 qt sideways rack that has 9 slots. Each shelf has its own belly heat connection. It can hold 5 32 qt tubs and 12 15 qt tubs. Or if I need it to, I can also fit 3 6qt tubs per shelf for hatchlings. Since I only plan on having a very small amount of snakes for now, this is what works best for me. One rack fits all sort of thing.. The whole rack only cost me about $500 and that includes a Herpstat and tubs. I never built anything in my life so I admit I was pretty proud of myself after this was finished LOL.
Good luck! Can't go wrong with either company IMO.