Ipv6 addressing for Core network

Hi, I am looking for the recommendation for core interfaces IP addressing schema for Ipv6. Some different views are (PE- P - PE, point to point link) as below - 1- Use Public Ipv6 with /122 and do not advertise to Internet 2- Use Public Ipv6 with /127 and do not advertise to Internet 3- Use Unique local ipv6 address 4- Use Public Ipv6 with /64 Also I am interested to understand the impact on TCAM ... Regards, Vikas