Sodium metasilicate vs sodium hydroxide

Sodium hydroxide is 'stronger'. They serve the same purpose as an ingredient and can make a roughly equal soap. But the metasilicate, also known as liquid glass, did make 'glass' pieces when I was forced to use it in a strong mix when out of SH. It seems like the MS is not as 'dangerous'. Metasilicate is no sodium hydroxide though in my opinion.
 
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