briank is right though. Just keep in mind that the following when making your decision:
PPTP - Provides data confidentiality. (Captured packets cannot be interpreted without the encryption key.)
Does not provide data integrity (proof that the data was not modified in transit) or data origin authentication (proof that the data was sent by the authorized user).
IPSec - Offers the highest level of security, providing data confidentiality, data integrity, data origin authentication, and replay protection.
Nathan