It depends on what your intentions are. I ended up buying the wine cooler and then contacting Forrest to have shelves made. Forrest is kinda credited to some degree for the popularity for wineadors. I believe he was really the first to make shelving for a wide variety of wine coolers and he is the one who makes the shelving for the NewAir coolers and I would imagine the other you listed.
Anyway, to the topic. I had him make 5 shelves with 1 drawer for my setup. 6 months later, i am only using 1 shelf.
If you like to buy a bunch of different singles, go for a couple drawers. If you envision buying mostly boxes, maybe get a drawer and 2 shelves. They'll fill up faster than you think they will and instead of putting a bunch of money into shelving, buy another box.