Reason 1: SMALLER FOOTPRINT
One of the biggest issues with setting up a home gym is the lack of space in one's abode to store the equipment. Partners, unless they are into resistance training themselves, are probably not too keen on having fitness equipment laying around the house. Dumbbells have the competitive edge here: they are smaller than kettlebells and are easier to store thanks to their shape. They can be stored under the bed, in the wardrobe or cupboard and sometimes, even on top of each other next to the wall. Not to mention adjustable dumbbells replace multiple dumbbells, making storing them super easy.
Reason 2: BETTER FOR GRADUAL PROGRESSION
Dumbbells can be bought in many shapes and, most importantly, sizes. The lightest dumbbells are around one lb (0.5 kg) and you can even buy dumbbells as heavy as 120 lbs (~55 kg). There are probably even heavier dumbbells. Better still, dumbbell weight increases gradually, meaning you can get dumbbells in practically any size you want. Again adjustable dumbbells replace multiple dumbbells, making working with them much easier .