As a new user, the way the favourite button dissappears after clicking +1 confused me. It should still be possible imo to click favourite after you have +1. Having to remove +1 just to re-add it again with favourite seems counter intuitive.
It's not something I expect people to do very much
If it were done the way you suggest then clicking "Favorite" would cause the "+1" to be removed automatically, which would also be confusing, just in a different way.
As a new user, the way the favourite button dissappears after clicking +1 confused me. It should still be possible imo to click favourite after you have +1. Having to remove +1 just to re-add it again with favourite seems counter intuitive.