Same price? Then I'm buying the Kona (I don't need the extra space the Niro offers) for the 400+ km range.
But in a few years I'm looking at 2nd hand prices, if the Kona is more valued and the Leaf is going cheaper - I would consider a 62kWh Leaf.
Looking on Trademe, yeah. A used import 62kWh Leaf E+ goes for between $60k-65k. There are a few used Kona and Niro's on TradeMe within that price range too.
I'd happily recommend a $10k-$20k used Leaf as the value of degraded battery modules alone can fetch almost that price but when you can get other EVs for the same cost with thermal management I'd always recommend the latter. Once you start getting over $25k you start to find liquid cooled BMW i3's with better safety ratings than Leaf's for the same price