DOW Thermax vs Sika RMAX Pro Select -- fire/exposure rated insulation

I need insulation approved to be left exposed in the unfinished section of an otherwise finished basement.

DOW Thermax seems to be the gold standard, with clearly noted exposure rating for interior walls.

Sika RMAX Pro Select also lists that it's exposure rated for "Attics and crawl spaces", which to me doesn't mean it's fit for use for my application.. but it could just be a verbiage choice since they wouldn't expect people to use it in other situations?

Thoughts? I've been waiting a couple days for a response from Sika.

CI Max is another option, but I can't find it in low enough quantities or reasonable shipping to me, so it's not an option. I'm only asking because RMAX is 1/3 the cost in small quantities and available at home depot.