Years ago I used 2D these were fluorescent but round or square not as good as fluorescent 5 foot tubes, but looked better, and still give out good spread of light.
So looking at between 5" and 12" units, it depends on ceiling height, for a operation point of view the fluorescent tube or LED version is still likely the best, but you want it to look domestic not industrial, so you have to decide what you think looks appropriate.
Son replaced one 5 foot fluorescent which I had already swapped the 65 watt fluorescent tube for a 24 watt LED to silly 2" down lights 16 of them, the lighting was about the same, power use when from 24 watt to 48 watt. Two 15 watt LED lamps would have done the same, but high ceiling. As the ceiling drops you need more lamps, and less power each.