Part of it is the community. I really like the OpenWRT community, but it’s harder to engage with them when you run a downstream distribution.
But also I’m a bit of a hacker (in the traditional sense). I like to experiment with custom builds of OpenWRT. (And FWIW, their build system uses the same menuconfig as Linux.)
Big +1 for Sync.
I was paying for Sync back when it was a Reddit client, and I moved to Lemmy mostly because that is where Sync moved.
It’s an awesome app. Best app purchase I’ve ever made. (There is a free version too.)