I love the Wiim range of streamers and just bought a Wiim Amp for my fitness room system (coupled with Dynaudio Emit 10 speakers).
First I thought I would go for the newer Wiim Amp Pro, but looking at the exact differences, and the fact that the older amp is available at discounted prices now, it wasn't wort spending the extra 120€ (that is the current price difference for my best purchase options).
Wifi 6, Bluetooth 5.3 is not going to make a difference in most cases. The DAC chip is just a newer revision, not a superior DAC as with the Wiim Pro vs Pro Plus
I think they should have named the Amp Pro "Amp Mk II", "Amp (2024)" or something similar, because people are likely to be disappointed when they see the lack of differences.
Or they should have added some new features to the Pro. What I miss from the amp is a pre-amp output, to be able to use the streamer part with a better power amp, in case the system is upgraded.