You’ll get more software updates with the A17 version as well.
I have the Mini 6 (since 2022), but I keep almost buying the Mini 7 that’s $100 off.
I have the Apple Pencil Pro, so that would be nice to use that on the Mini 7, and even though the specs of the Mini 6 are decent and perfectly usable right now, there’s no telling how long it’ll be before a Mini 8 releases. I’d hate for the Mini 6 to start to become slow and dated before the Mini 8 releases.
But in reality, if you can get a good deal on the Mini 6 right now, there’s nothing wrong with it.
Mine still works great, but I’m sure the battery health is waning. Speaking of battery, you can set the 80% charging limit on the Mini 7. There’s a lot of tiny differences between the two Minis, but the biggest difference is probably having double the RAM (if that matters to you).