It might depend on who you are. I think Backblaze is well known on here because they've been around for longer and their hard drive stats posts are well liked.

If you're a less technical CTO, Wasabi seems to do a lot more traditional marketing on things like sports games: https://ibb.co/21qNkM9b (NBA, NHL, Premier League soccer). I'm not saying that makes them better, but a lot of people with purchasing power are going to be seeing Wasabi around.

Wasabi has also been pushing value-add services on top of their storage with Wasabi AiR (https://wasabi.com/cloud-object-storage/wasabi-air). It's basically an AI-powered database of your content. If you're running a place generating lots of content, having a system automatically tag and make searchable all those images and videos is a really nice value-add. Being able to search for a video clip containing a specific person in your library junk pile of video can be nicely useful for a lot of organizations.

It could just be that different people get their brand awareness from different places.