When all falls exclusively are considered, a reasonably good estimate of the general population of meteorites reaching the Earth may be made. In other words, most meteorites falling on Earth are by far chondrites. Finds are meteorites that were not seen to fall but were subsequently discovered on the ground, often long after they landed. The vast majority of meteorites in museum and private collections around the world are finds, not falls. Because stones tend to look like ordinary terrestrial rocks, especially if they were subjected to weathering, they are easily overlooked.
Stone finds are therefore rare in spite of the commonness of stones among falls.
Meteorite collections are instead dominated by irons, which not only have a distinctive appearance and are therefore easier to spot, but they resist longer than stones to weathering and are particularly amenable to being found by metal detectors. Stony-irons would also be common among finds if it weren't for their lesser resistance to weathering compared to irons and, more importantly, for their extreme rarity among falls in the first place.