The no one ever got fired for buying IBM wasn’t about quality. It’s always safe to buy the default choice that everyone else uses. Especially when things go wrong.
Many want to be founders here on HN don’t get that. Even if your product is better and cheaper, there is too much of a reputational risk signing a contract for a B2B SaaS product with an unknown vendor.
On a completely unrelated note, for the love of all that is holy don’t try to do B2B SaaS without SSO support.