I did the same. Migration from 2019 to 2023 works fine for devices, flows and setup.
Is performance better? App is way faster. Response time of devices not much. I had hoped this was way better. I migrated from early 2019 to early 2023.
Is range better? Yes absolutely
In my opinion if your 2019 is not causing any problems just stick to the 2019
And,
Afaik to transfer the actual data, you do need a recent cloud backup, which you can re-read at the Pro 2023.
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Indeed, @Stefan_de_Vogelaere for example, a zigbee signal is a zigbee signal. This is not “flying” faster with a new Homey.
Only the time it takes to send the signal can be shorter with an overall faster system.
But… I use zigbee2mqtt as well, and I was surprised by the improved response time, even while wifi is added to the signal chain. It is 1 second quicker compared to zigbee on my Pro 2019.