Heimdal or MIT kerberos

[sam]

Hi,

I m not sure which kerberos I should use. With Heimdal, it is a 
thread-safe implementation, while MIT's kerberos is not.

Please correct me if I m wrong, it appears that there is more 
applicatoins support MIT kerberos than Heimdal.

I basically want to use kerbeors as a SSO server and allows various 
internet/network service to securely authenticate with users. 
Applications I would like to be kerberized is samba, apache, email (ldap)..

So which kerberos should be used to avoid future difficulty of 
integration with the above application?

thanks
sam