Hi oldfashioned1536,
I agree with aceflibble there is no best, you just have to get what you need. And this might need some trial and error (best before breaking the piggy bank)
Coming from Aperture because S. Jobs inheritors killed it, I downloaded Lightroom, Aftershot, DxO and Capture 1 on thirty day trials and 'played' with them to see what suited me best.
So I would suggest you do the same, however I do not know if Iridient is available on a trial basis.
Hope this is useful.
Best regards
Jeremy
FWIW : I opted for Capture One, which I now use exclusively, and to date have no complaints but this is me. But others may have different experiences.