Choosing an LMS is challenging, not least because there is a vast array of LMS's available and they are often built for different markets.
I wrote a LinkedIn article recently on the the subject of differences between LMS's:
(6) Not all LMS's are born equal... | LinkedIn
The bottom line is that understanding your requirements (including what information you want to track) is vital. At the risk of making the choices over SCORM or xAPI even more confusing, it is worth mentioning that there is a third option cmi5 which is supported by Storyline and many LMS's that extends the range of data sent back to the LMS without having to go to full xAPI and implementing an LRS.
Good luck with your search,,,