Personally, I rather liked the approach that Oodoo takes: https://www.odoo.com/
It tries to be pretty modular and even the cloud hosted plans can be mixed and matched, in addition to which the apps can be self-hosted for free: https://www.odoo.com/page/all-apps
Of course, attempting to compare it to something like SAP is a bit like comparing OpenProject with Jira or something along those lines: where one of the solutions is way more popular and recognizable, even if the other could be serviceable in certain scenarios. It's pretty clear which one will be picked by most of the enterprises, though.