Orion uses WebKit and I assume they try to track as close to the release branch as possible. So if you trust WebKit, you can trust Orion.
Personally I'm more of a Brave guy though, despite having been a Kagi user since 2024 :).
What I'd really wish for is an EU browser that 'just works'. Vivaldi is nice but it often has papercuts because it has a small team behind it that have to try to support a mountain of features.