I went through the logs but struggled a bit to find any notable differences. The config is very similar (existing differences don't relate to networking at all), the logs are largely similar. I noticed that the laptop had old routes still active. Probably because of standby, OpenVPN can't clear the routes in this case. If you reboot (not shutdown + startup), they should be gone, but they shouldn't relate to your problem in the first place.
If it's not an issue, use OpenVPN for the time being.