They both look rather nice actually. I haven't used orbtk at all, and I've barely done anything with Iced.
It is worth noting that the way that orbtk is targeting android right now is through
cargo node which hasn't been updated in two years and also works by using the web build of the UI. This means that:
- Cargo node probably isn't getting updated and may or may not work right now, you'd have to try it
- If Cargo node works, you could probably use it to deploy the web version of Iced to android as well
So as far as cross-platform-ness I don't know that theres a big advantage to orbtk at this point.
As far as how easy they are to use, a look at the examples makes me think they are both pretty easy and you'd have to try them out for something to figure out for sure.