I am currently redesigning my kitchen in a 1930's Midwestern USA house. The kitchen has a decent floor area but the floor plan is oddly restrictive.
My space next to the sink is such that I can either have a standard 24" dishwasher next to the sink and a slightly weird cabinet adjacent to it, or I could have an 18 inch dishwasher at 45 degrees flanked by two small but reasonably sized cabinet doors (or drawers), although the 45 degree plan would dictate a somewhat shallow custom counter depth on the flanks (like 18-20 inches).
I think I would be more proud of the accomplishment of building the angled design, and I think the ergonomics would be optimal.
But I'm not sure about the smaller dishwasher. I have never used a smaller one. It seems like it would be enough for my small family and still plenty helpful for gatherings.
I think I imagine myself running the washer daily, and washing a couple oddball dishes here and there.
I'm in my 40s and I'm getting my first dishwasher, so I'm used to needing to do a load at the sink for a half hour a day.
If I understand things right, my drying rack seems like it would be smaller than an 18" washer, so for the day to day operations (the time that really stacks up fast), running daily would still be a major improvement.
That said, I know how convenience is compelling, so the big question is do I want the added luxury of 6 inches wide haha... I don't know.
The apartment we bought came with an old 18” dishwasher.
We run it daily with two adults and it works great. Even though you need to run it more often, it’s takes less time to empty than a full size.
For our current layout it makes a lot of sense but would want a full size if the family grows.
If I was single I would prefer the smaller format. I find it kinda nasty to have my dirty dishes standing for many days.