Purely from an insurance underwriting standpoint the demerit points are irrelevant, they are used by the MTO to decide when to talk to drivers about their driving habits. To an insurance company a speeding ticket is classed as a minor offence, now if you get hit with stunt driving for being way over the speed limit that is seen as major or criminal.
Every insurance carrier in Ontario has to file its underwriting rules with the FSCO, and those rules include how they rate people with tickets, some companies will jack your rates when you get your first minor, others (including my carrier) will do nothing (except maybe lose your conviction free discount) until 3 minor, in that case they are not raising your rates but you are loosing a discount.
If you are insured through a broker, talk to them for advice. A good broker represents you and has multiple carriers to place you with.
If you are with a direct insurer or an insurer that uses agents (State Farm etc..) Maybe best not to talk to them, an agent represents a single company though not necessarily as a direct employee. They represent the company... Basically if the person you are talking to answers the phone with the name on the top of your policy, they are not representing you.
*** Disclaimer *** I am a former insurance broker, though no longer licensed and now working in a different trade. This information should be taken as it is given, advice from a peer, and not be substituted for advice from a currently licensed insurance professional.