My choice is Covalent Symbol and a new project that I have high hopes for, this project has 2 Moonriver and Moonbeam tokens.
Good luck with that choice. I'm not familiar with it so I wouldn't dive in with projects that I don't have any idea.
I could only say that Moonriver in the Kusama network took a slot in the parachain by taking 2nd place. Moonbeam will be on the Polkadot network.