I've done the math. You can store about the same amount on a single tray of a pie-cut (90 degree corner) lazy susan in a 36" square cabinet as you can in a single corner drawer made Blum style. The difference is something like 2%. The angled susan, that cuts across the corner and therefore has more interior space, has a smaller door, but each tray holds about 20% more than if you had a blind corner with no "solution", and about 12-14% more than the pie cut susan or drawer. Most people do two trays on their lazy susans, vs. three or four drawers in a stack, so given the same cabinet area, the drawers win for surface area.
If you're using your susans for small appliances and large pots, and therefore filling the vertical space, there's no real difference (i.e., between two pie cut trays or two drawers), and for those bigger things, the round shape of a super susan (no pole) will probably allow you to get more stuff in. If you have smaller stuff, like canisters and utensils (what I have in one stack), you can get more storage in with drawers. I love being able to just dip into my baking staples canisters without having to pull them out.
Additionally, if you want to give up full extension, you can make the drawers longer than designated and have them hold that much more.
The two knobs on each drawer are for show. I only use one. Here are some pictures. The dishes were an experiment. I moved them to the uppers and put the plastics in that drawer instead. Above is flatware, below are the tea towels:
Here's a poor picture, but it shows how we extended the drawer back, utilizing all the available space:
If you have MDF with veneer or some other kind of very square fronts, Blum makes a gizmo that folds the fronts together as you open the drawer, so that they are flush when closed and pass easily when opened. If your drawer faces are wood (or plywood), you can just bevel the edges:
This sketch shows my first redesign from the Blum plan (though they may have changed it in the time since). They have pictures of it this way so that's what I thought I was getting. :(
When I sent them back to the cabinetmaker to be fixed, his guy figured out how the style could be adapted to use the regular corner drawer hardware but extend farther back. The glides end at the end of the long side (small triangle) on the original style:
I LOVE my corner drawers!
I'm mostly a "booster", however, because so many people are totally unfamiliar with them and wrongly think that it's a lot more wasted space. Just trying to be informative. The more choices available, the better.
Q