When I clone I prefer to clone in Aeroponics.

If you Ph the rockwool at 5.2 for 24 hours first it is fine most of the time they say. I just find that for seedlings and even clones I gift that the jeffy peat pellets are great. You can gently rip away the mesh holding the peat moss together and soak them in water to wash away the peat moss. Then you can plant just the rooted clone in either hydro or dirt and not worry about overwatering the root ball or salt build up around the root ball when they are young.

So for me it's
Aeroponics cloner
or
Jiffy Peat Moss pelets