Wire nuts vs lever nuts
I have never used lever connectors but AFIK the WAGO should work great.

They are only approved for copper conductor (not aluminum). With the special WAGO joint compound they would probably work with aluminum. I think they do not accept wires over #12 so this would limit their use with aluminum.

I have heard that there are counterfeit WAGO lever connectors in the market so be sure to get them from a trustworthy source.