Did the older one not have the v2l socket under one of the front seats at all? I found conflicting information online that I thought some of the older trims had it. Silly as it sounds I did really like that feature; it wouldn't drive a hoover because of the starting current but it let me run a PA system for the local village 10k.The newer one is generally a bit nicer to drive, and has one-pedal-drive, also depending which trim level you go for, you get V2L.
Other than that, there's not much in it other than cosmetics (and as you've mentioned, the warranty); the battery and drive-train is the same, so the range/power/charge speed is identical.
£5k pays for a lot of out-of-warranty repairs!
As far as I'm aware, the Kona is the same car underneath, just in a slightly smaller package (and obviously with a Hyundai badge)
