It's a case of catch 22.

More range = shorter lifespan, so you will need a new car ( or battery ) sooner!

Let's just say for simplicity sake, 40% to 60% = a 15 year, 220,000 mile useful battery.

Let's say 35% to 65% gives more MPG but = a 10 year 150,000 mile useful battery.

Who wants which? Sounds like personal preference to me.
There's no real advantage to one over the other as I see it.
Both batteries should have about the same utility. -John