Do I need a no-hookup countertop dishwasher or an 18-inch built-in?

Reviewers frame this as a space-and-installation question. No-hookup countertop models (COMFEE', Midea) suit renters, dorms, and RVs because they fill from a built-in tank with no plumbing, while an 18-inch built-in like the Midea slim unit offers more capacity for small kitchens if you can plumb it in. Community threads note the built-ins clean larger loads but have drawn more drainage and reliability complaints.