Just another experience here: I have a Galaxus Unlimited plan for 19CHF + a second SIM for 5CHF which goes in my 4G router. I get at least 80Mbit without hiccups and use it for video conferencing etc. Two things are important:
- Have a radio tower nearby, you can use this map to check: map.geo.admin.ch
- Use a good router. We had a cheap one before getting a good one and got only 20Mbit with that. Now I bought a used Huawei B818-260 on Tutti for 80CHF and am very happy