I have a project ready in my company where I use pfsense on the edge of the network, the equipment plays the role of Proxy, Firewall, gateway and VPN with SSL certificate, but a third party to come deploying an accurate point-to-point cloud access use this already configured network, and ask us to use pptp or L2tp VPN, I would like to know which one is the safest for my project, considering the company data that will be transferred to the third party environment.