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Personally i would think it would be easier to roll your own. I am not sure how up to date a built in VPN on a router is kept up to date. I would definitely not use PPTP, that has been a security hole for years, IPSec is more of a enterprise thing which by itself isn't secure, so you need to pair it with L2TP, so it's more convoluted. OpenVPN is fine, but again I'm not sure how up to date the OpenVPN server on the router is kept up to date. Since you have a RPi, you could set up a PiVPN on it, which is a script to set up an OpenVPN server on it. It's super simple to set up. You will need to open up a port on your router though. A newer and more secure method to access your RPi is based on a newer protocol, Wireguard. You can create a Wireguard server, or use a thing called Tailscale. Tailscale is based around Wireguard, but you don't need to open up ports on your router. https://tailscale.com/ With Tailscale, you can set it up so you can use Tailscale just to access your RPi from home, and all of your internet traffic doesn't go through Tailscale, or you could set up your RPi to act as a traditional VPN server, so all of your internet traffic will go through your Pi. This is like if you want to do banking, accessing social media, etc on unsecured networks. It helps to have that extra layer of security.