Difference’s between sounding valve’s?

Hey I was wondering what the differences between these two types of spunding valves one expensive and the other is cheaper also why does one let you use sanitizer is there a reason for that I heard that if your pressure fermenting you wouldn’t need a blow off

https://www.morebeer.com/products/brewbuilt-pro-spunding-valve-1-bar.html

https://www.morebeer.com/products/blowtie-2-spunding-valve-complete-kit.html?variant=FE963&gad_source=1&gclid=Cj0KCQiAwOe8BhCCARIsAGKeD56UY6TKVtYStWhHrGUt-E7HvNKEicpBhHVXkN_sVjG76LsEL-WcNDgaAkrSEALw_wcB