Would a JRPASS work for our itinerary please?

Hello -
We will be Japan in March 2024 (3 x adults).
We have private transport to Hakuba.
- Then we need to get from Hakuba to Osaka. - We are in Osaka for 5 nights and plan to do day visits to Kyoto etc. - Then we will be going from Osaka to Tokyo for 5 nights (with possible day trips as well). - And on the last day we need to get from our hotel in Tokyo to the airport. Would a JRPASS be a good option for us? Or would we be better to buy train tickets as we go?
And if we do buy a JRPASS - should we get a 7 day ticket or a 14 day ticket?
Thank you so much,