I've noticed my company's GA is set to www.example.com when they actually only redirect to it from example.com. Should I change to the correct version or does it not impact GA's data collection?
It does not affect data collection in GA, however for the sake of consistency and clarity I would correct the website url in the Property's Setting page and each View's Setting page.
This will also help prevent confusion if/when linking the GA Property to Google Search Console (Google Search Console requires a verified prefix url property to link the two services. In GSC it would need to be the correct domain name and protocol that is being redirected to)