1: ourBizNameSoftware.com 2: ourBizName.software
Second one is much easier to type and remember but we are worried about trust and seo implications. HM, what do you think?
Having the .com domain will come in handy, because you can measure how many people use it even if you only mention the .software, and you can switch to that when you get tired of trying to explain it.
Also: .club domains were famously down for a few days, so pay attention to that. .ORG is another one worth trying, but mostly non-profits use that (but you are free to setup a .ORG business site if you want)