It depends on the OpenVZ kernel, some later version can use WG. But OpenVZ is dying anyway so if someone use a still supported container technology, WG is proba

It depends on the OpenVZ kernel, some later version can use WG. But OpenVZ is dying anyway so if someone use a still supported container technology, WG is probably available. Depending on the ISP setup, sometimes WG can be less reliable due to MTU and/or UDP filtering, I remember an ISP from years ago where WG don't work only on certain hours, while OpenVPN running on the same server still work.