Buy the Titan Fitness T-3 Series Wall Mounted Folding Power Rack.

One of these builds real strength for years, the other tops out at 100 pounds total and stops there.

What was compared

1. Only one of these gets you past a light squat
The Nuobell set tops out at 50 lb per hand, 100 lb total, fine for curls and presses but a ceiling for legs and back. The Titan rack holds a loaded barbell as heavy as you can buy plates for, so your strength never outgrows the equipment.
2. Trains your whole body, not just your arms
A power rack lets you squat, bench, deadlift off pins and do pull-ups, the compound lifts that build the most strength and size. The Nuobell set covers presses, rows and curls well but cannot replace a real squat or bench session.
3. Folds flat to the wall, dumbbells still sit on your floor
The T-3 is wall mounted and folds back against the wall when not in use, barely eating any floor space. A 50 lb per hand Nuobell set still needs a tray or stand taking up permanent room in the same garage.
4. Costs less and becomes the center of your gym
At 417.99 dollars against 699 dollars for the Nuobell set, the Titan rack is cheaper and you build around it with a barbell and bench. The dumbbells are a closed system, you cannot add anything to raise their ceiling.
5. Yes, the dumbbells swap weight faster. Doesn't matter.
The Nuobell dial really is quicker between sets than reloading a bar, that part is real and well documented. But that speed only helps accessory work, it does nothing for squat or bench day, which is where most strength actually gets built.