It's not either or, it's both and. Of course there are different options that have better results in some axes. Building wind does not mean not building nuclear, solar, hydro, tidal, biomass pyrolysis, etc.
Yes, but due to the nature of wind being fickle, we have to keep these other energy facilities running and people employed. This adds to the costs of these other energy solutions while they are doing very little while wind is blowing. This messes all these metrics up.