THIS. The ARIYA is the first EV they've widely released (last year) with any active thermal management. I live in AZ, and all my friends with Leaf's all have had to have their batteries replaced at least once.

All my Chevy based EV/PHEVs have had great battery life (so far) - knock on wood.

I'm also in AZ. What's surprising to me is I get slightly better range in the summer months.