Bridging the network between two small offices - SoftEther vs. Ubiquity Networks

Been using SoftEther VPN Server and VPN Bridge on two older Mac Minis (one macOS High Sierra and the other Ubuntu Server 19.04) to create a layer 2 bridge between two offices.

There is a single /24 subnet - half the addresses allocated for office A and half for office B. The gateway for office A is .1 and .254 for office B. DHCP for each office only hands out addresses for its range and SoftEther prevents DHCP from going across the bridge.

Has anyone compared SoftEther's performance to an EoGRE layer 2 tunnel using Ubiquity Networks equipment? Saw this tech note from Ubiquity Networks using EdgeRouters to create an EoGRE layer 2 tunnel and it seems to fit our scenario but wondered if performance would suffer compared to SoftEther.

Also interested to hear about similar approaches. Have read that SoftEther is faster than OpenVPN but I'm not sure if this is hype or has been verified.