Which title insurance company - are there options?
There are five title insurance companies in Canada: Stewart Title, First Canadian Title, Chicago Title, Travellers, and TitlePLUS. Only TitlePLUS is a Canadian company operated by the Law Society of Upper Canada. The remainder are US companies. So yes, there is a choice. It's important to know that while their policies are substantially similar, they do differ in the nature of certain aspects of their coverage.
Usually real estate lawyers deal with one title insurance company with whom they are comfortable and have a relationship. Some will only do your deal if you take their recommendation, others will accommodate a different insurance carrier. There's nothing stopping you from doing your research and if your first choice of lawyer doesn't offer the policy you want, finding another lawyer that does.