Both make you a bit itchy...
Fibreglass has silica in it as one of its main ingredients but a load of other stuff.
Silica wick, or high silica wick is mostly silica. 95%+ with the good stuff.
Fibreglass had a lower melting point and indeed can melt if you torch it.
Fibrelass is more... Fibrey
Any hypothetical health risks from vaping using either would be from inhaling the fibres
Fibreglass is cheaper
All atomizers used to have fibreglass wicks
I'm surprised no one has tried using kevlar or ceramic wick yet tbh
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