There are a lot of SEO-spam sites that look a lot like this one that are designed to top the results for searches like "technology 1 vs technology 2". They are all completely useless.

IMO If you really want to provide value, you have to dig into the actual details of these technologies, not just offer a top-level blurb and category label.

Just look at any Show HN post comments, engineers crave the details when it comes to comparing and choosing technologies.

Example: One thing I have always desired is somewhere to see all the major databases/event stream/persistence technologies and see what kinds of different consistency guarantees, replication, backup, recovery, etc. they each offer.

This goes a bit deep (most datastores have a bunch of different ways to configure and tune them for different consistency levels [1]) and is obviously more effort than the low-effort "this vs that" sites, but I don't see much value in the existing "this vs that" offerings.

[1] https://docs.redis.com/latest/rs/concepts/high-availability/...