I’ve used both, and been very pleased with both.

Mint stood out, last time I installed it, because every decision was easy and factual and about me (what time zone, what keyboard).

I essentially just pressed “next” a bunch of times.

Kubuntu was nearly that good last time I tried it, as well.

Between the two, I generally recommend Mint primarily because it keeps the messaging simple and consistent with the community.

Secondarily, because Mint doesn’t have Snap.