To me the biggest detriment to using a quiz embedded in a SCORM vs. a quiz in Moodle is that a creating a SCORM package requires an, external to Moodle program, to develop the quiz. There are a few free programs, but the most capable ones cost money...lots of it. During use, if you detected an error, even something as minor as a misspelled word, you had to use the external program again, make your changes, generate a new version of the SCORM package, and then get it into Moodle, hopefully without wiping out the results of any completed quizzes.
Doing the same type minor correction in Moodle is almost a no-brainer and very simple to do, edit the question, make the typing correction, save and your done. Even if you had to change or modify an answer, Moodle has built in regrade and/or override capability. SCORM...I don't know.
Copying a quiz from one course to another in Moodle can be done a couple of ways. Import lets you bring a copy of any activity from one course into another. Sharing Cart, an addon, lets you do the same thing.
Copying a quiz from one LMS to another is easily done by backup and restore. During the process you, get to decide what is included in the backup or what is restored during the restore. In other words, your backup can include any combination of activities in a course, and then when you restore, you get to pick which ones you actually want to copy from the backup, into your course.