Which manufacturer of polystyrene, insulation, edging elements should one choose?

Is Finja polystyrene better than Bewi?
Should one choose Isover or Rockwool?
Are Knauf plasterboards the best?

Which manufacturers are the best and have the highest quality when it comes to

Polystyrene - Ground insulation
Edging elements of F-model
Insulation - Exterior walls
Plasterboards - Wet rooms and interior walls

Underfloor heating - which supplier should one choose?
 
Rickard.
Is Finja cellplast better than Bewi? I don't think so.

Should you choose Isover or Rockwool? It depends.

Are Knauf plasterboards the best? Doubtful, but they are good.

My point is that it's not so easy to answer what is best.
 
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