I think it has much more to do with how the Wings want to build their team than any individual performance in March. Azzi, Fam, Betts are VERY different players and I don't think there's a clear "best player in the class" that you pick regardless of it.
Fam is young and untested and likely gives you similar to what Malonga gave Seattle last year in short run, but upside is massive. Azzi is a pure shooter, 3 and D, I think projects as good to very good WNBA starter. Betts is more of a risk only because there are so few players like her in the league right now, but no doubt she finds a place.
IMO, the surest best is Olivia Miles, but Wings don't need her with Paige already on the roster.