7 days or 14 days JRpass?

I'm planning to go to Japan this November

This is our schedule:
- 15th to 18th we will be in Tokyo - 19th in Kawaguchiko - 20th in Hakone - 21st to 23rd in Kyoto - 24th and 25th in Osaka - 26th back again in Tokyo

Now here comes the question,
Do you think it is better for me to get myself a 7 days JRpass or 14 days JRpass?
Which one is more efficient and more beneficial for me?

Please help. Thank you very much.