Website: https://www.thestratos.org/ Very comprehensive site with a current blog, product information and FAQ. Stratos is quite a techie project so some of the information on the site doesn't make for light reading, but I think the average person will find the general information accessible and fairly easy to comprehend.
The core team regularly attend global conferences to promote the Stratos brand. They also host frequently AMAs in Twitter Spaces, approximately one per quarter.
Overall marketing verdict - I think the team do their best to keep the community informed and show that they are constantly improving and working towards mainnet. However, the marketing lacks any real excitement or 'vibe' with the updates being mostly informational with no sense of fun (e.g. no contests, games or giveaways). The team hosted a quiz at TGE, but have not engaged the community in such a way since then. While these things are not always necessary, they can often add a more exciting element to being a community member and investor. Show Less