The desktop gets updates more, the android app is more stable, but it kinda depends on what you want as to which is better. If you want bleeding edge features then you probably should use the website which gets updated the most
I don't know if itch has a "beta" path, i could start using that.
Though if you have specific problems, best thing would be to report those to me. I'm always on discord if you want to hop on and list all the problems off.
I'm a solo developer and I don't have the time to test every device, so bugs can slip through