@bram VPN protocol you choose really depends on what you’re prioritizing security, speed, or ease of use. OpenVPN is probably the most popular because it’s both secure and flexible. It works on almost any network, but it can be a bit slower compared to newer protocols. IKEv2/IPSec is a great choice if you’re dealing with mobile devices because it can reconnect quickly when switching between networks. L2TP/IPSec, though, is outdated now, and PPTP shouldn’t even be considered because of its security flaws.
As for the VPN types, it all comes down to your organization preferences. Remote Access VPNs are great if your employees need to securely connect to the company network from home or while traveling. If you’re looking to connect two office locations, then a Site-to-Site VPN is the way to go. SSL VPNs are useful when you want to provide access through a web browser without needing a dedicated VPN client. From my point of view, I would suggest you check in detail about all the protocols.