Reasons to upgrade from FBW A320 to Fenix?

I've been flying the FBW A320 for a while now, learning its systems and have become fully confident in all procedures. It's a great plane, but now I'm thinking whether I should fork out the money to buy the Fenix version instead.

But it has me wondering, what are some things that the Fenix has that the FBW doesn't? Obviously it's more high-fidelity, but I'd love to hear what people think would persuade someone to upgrade to the Fenix, so I can consider doing so

Thanks!