The Gaming Edge WIFI has 60A smart power stages, while the Tomahawk is not 55A Dr. MOS, so the Gaming Edge has slightly better power delivery, but the Tomahawk can still handle even a 3950X just fine so it's not like you'll ever notice the difference. Heatsinks are also pretty similar between the two iirc.
Other than that, pretty much the only difference I can think of is that the Gaming Edge has onboard WiFi 6, whereas the Tomahawk has dual LAN, but since both the 2.5G and 1G are Realtek, it's not that useful really.
Basically, if you need onboard WiFi, get the Gaming Edge. Otherwise, get the Tomahawk.
Edit: Okay nevermind, they're both on 60A smart power stages, so the VRM is the same on both. I confused them with Z490.
Only notable difference is the WIFI, and I guess the fact that the Gaming Edge WIFI has a heatspreader for the bottom M.2 slot as well, not just the top one.