Rockwoll is the worst. It handles poorly, it is not renewable, it is energy intensive to manufscture, if its older than 1970 it is likely manufactured with asbestos and most importantly it had those tiny scratch fairy's that attack you for days to come.

I learned recently that the phase shift of rockwoll is terrible because of its low (thermal) mass. Meaning that it will become saturated rather quickly and then dissipates heat onwards. For a few years (20?) there has been an alternative made from wood fibre that is bound together by some degradable agent and impregnated with amonia salts (not great but loads better than the alternatives). it is recyclable as I'm the company picks up the offcuts and reuses them. But most importantly its high mass (15kg per m²?) Is perfect for home roof insulation because it keeps most of the absorbed energy for about 12 hours before it's saturated. Keeping you cooler during the day and radiating inside and outside at night. Its called gutex and is very versatile.

Edit: it comes in fluffy and light style too as gutex thermowall. More like rockwoll I guess I can't recommend it enough. There are generic manufacturers too I am sure.