Many different people use many different forms of magnesium, depending on what they need it for. I use mag oxide to help pull more water into my lower intestines, and mag orotate to help with muscle twitches and spasms as I have found those two work best for me.
Here is a page that I share a lot, so that people can find what each type does in the body and how well it's absorbed:
/www.globalhealingcenter.com/natural-health/types-of-magnesium/