Which remoting app do you prefer?

I have tried the Mobile Mouse for iPhone on Windows 10. It does work good when all security settings are properly set. The phone then basically works as a mouse pad on your PC. The drawback is that it does not (or with difficulty) works on wifi networks that have strict security settings. You can define on which port the server is running and sometimes you need to enter the IP address manually before the connection succeeds. But usually (check the firewall on the laptop as well) it should work fine.

The free version just acts as a mousepad. The paid version will also do onscreen display on the iPhone.