Which pass will suit our travel needs

Hello
My husband and I are travelling to Japan for three weeks in October on the following itinerary
Day1-7 Toyko
Day 8-10Hakone
Day 11 -17Osaka visiting Kyoto & Nara
Day 18-21 20Hiroshima/Miyajima
Leave Hiroshima to return to Tokyo for flight home

I am looking to understand whether it is best to get a JR rail pass or regional passes.

Thanks

Karen