First off, what is the difference between a .my and a .com domain extension? Generally, as the name suggests, a .my domain extension would indicate that the site/company originates from Malaysia while a .com would suggest the company to be global or internationally based. 

However do bear in mind that .com is global so there is a higher chance that a foreign company who shares the same name as your company might have registered for the domain name before you. The risk of encountering a local company with the same name is lower for .my domain extension so it is crucial to do your research first before deciding.

Another factor to consider is if your customer based is largely local / within Malaysia, a .my domain name will rank higher when a user searches for your company online. For international companies, it would also be wise to have a .my domain extension for a local branch to highlight the company’s local presence and to establish a platform for localised content. 

However, there is no single factor that can guarantee your company’s SEO outcome, for example, Amazon, despite having a .com domain name still has top ranking over many local sites. It’s best to do your research on all these aspects and weigh the pros and cons of using a .my or .com domain extension before making your decision.