7 or 14 days

Hi,
I'm wondering whether you can advise which pass is best to get, 7 or 14 days? My itinerary is:

Day 1 - Tokyo
Day 2 - Tokyo
Day 3 - Osaka
Day 4 - Hiroshima
Day 5 - Kyoto
Day 6 - Kyoto
Day 7 - Nagoya
Day 8 - Hakone
Day 9 - Yokohama
Day 10 - Tokyo
Day 11 - Tokyo
Day 12 - Tokyo
Day 13 - Tokyo
Day 14 - Tokyo
Day 15 - Tokyo

Also if i did get a 7 day pass i would want to activate it on the morning of day 3. Can i reserve a seat on the evening before without actually activating the pass?

Many thanks.