Comparing Grodan Rockwool Slabs - Which one is the best and why?

Hello everyone,

which Grodan slab do you use for a drip system, and why? I'm using GT Master now, but considering a change towards Vital. Any thought?
There are 3 options:

GRODAN PRESTIGE vs.
GRODAN GT MASTER vs.
GRODAN VITAL ?

Thanks, cheers!