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i like small rockwool cubes for both clones and seeds becuz it seems you cant possibly overwater. i have had great success with seedlings and cuttings just sitting in a tray with a few mm of water in the bottom
however, i think its important to cover the tops so light does not shine on them or algae can grow on the surface and block the 'breathing' or gas exchange.
the very easiest hydro grow ever was in long rockwool slabs that came wrapped in plastic: poke a hole in one end for a tube to pump water in, a drain hole out the other end, a few holes in the top to plug in the plants, and Bob's your uncle!
after harvest tho, the big root and water-filled slab weighed a ton and was a pain to get rid of.
but rockwool is kindof evil stuff, not very eco friendly and the dust is very bad to breathe or get on your skin, so it should be kept wet and never handled without proper safety gear.
i also like the clay pellets (also called hydroton) for the reasons mentioned above but i have had toppling plant problems during flowering.
ive had good sucess with clones and seedlings in peat pellets (also called jiffy pots) but its important to remember that they will hold a lot of water for a long time
i have had good results with straight home made organic compost. i was afraid it would be too strong and burn them but they grew with more vigor than sister clones in store bought potting soil
ive had varied results with soil i just shoveled out of the garden, one main drawback being that it was full of seeds, and all kinds of unwanted weeds began to sprout in the pot with my good weed.
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