When it comes to the strength of glass, borosilicate and quartz are the same. But when it comes to thermal resistance quartz has borosilicate beat. Borosilicate if heated past 1050 can cause stress in the glass making it weaker and more prone to breaking. It’s why it’s not a good idea to heat your boro to red hot. Quartz, on the other hand, can glow red and then be put in water for a fast cool down without the quartz cracking. No glass beats quartz when it comes to thermal resistance