fire damage: sodablasting Vs Glass and Primer

I am working on a fire damage property and I am sub contracting the soot removal and cleaning of charred rafters to a restoration company.
I was offered two possibilities: both applications include the use fogging and ozone machines but for blasting the first offer uses soda blasting,while the other will use crushed glass blasting and application of sealant (kilz2). I will do the demolition of the plaster, replace the new floors and eventually apply the primer/sealant.
what do you think? soda or glass+primer. Is the primer application even necessary the contractor says that glass works very fast and is cheaper.
Thanks Joe