re 1) - see my thoughts here: https://moodle.org/mod/forum/discuss.php?d=393609#p1588111
short version - use H5P
2. I think Moodle's built-in SCORM 1.2 implementation is pretty good these days, but you still need to tune your server correctly - (a lot of people run Moodle on a cheap un-tuned web host and on these platforms SCORM can struggle a lot.) The gold standard (for SCORM) is always anything that uses Rustici's scorm engine. You can run this in Moodle (although the Moodle plugin probably needs an update) - there are also quite a few cloud hosted LMS systems that white-label the Rustici engine.
short version - use H5P
2. I think Moodle's built-in SCORM 1.2 implementation is pretty good these days, but you still need to tune your server correctly - (a lot of people run Moodle on a cheap un-tuned web host and on these platforms SCORM can struggle a lot.) The gold standard (for SCORM) is always anything that uses Rustici's scorm engine. You can run this in Moodle (although the Moodle plugin probably needs an update) - there are also quite a few cloud hosted LMS systems that white-label the Rustici engine.