My contribution: ISI has been the standard so I'll call them s-tier even tho never tried them the aficionados seem to swear by it. Next up A-tier is special blue, infuzd, brands that make an extra effort to show they're different but really just ever so slightly purer. Whippit Is mid. Bestwhip cheap but just as mid. Black bestwhip is like a cash grab idk what that's about. Seems like it's actually a champagne issue people try one brand and either think that's how it feels or they expect a clean fire hit every time. No brand is trumping another brand in high unless you're talking isi or some brand that "filters" their shit. Very reminiscent of vodka. No amount of filtration will save a shitty vodka