A super visa is a two year multiple entry visa for up to ten years for parents and grandparents. A visitors visa is as of Feb 2014 is also a multiple entry visa for up to ten years, it does not require insurance for a year you can purchase insurance for the duration of the visit. A unlike a super visa a visitors visa in not restricted to parents and grandparents, you can apply for a visitors visa for your brother, sister, best friend etc...
https://www.stone-hedgefinancialgroup.ca/visitors-to-canada
https://www.stone-hedgefinancialgroup.ca/super-visa-insurance
https://www.stone-hedgefinancialgroup.ca/visitors-to-canada
https://www.stone-hedgefinancialgroup.ca/super-visa-insurance