if you can afford the hardware, getting something dedicated like a JetKVM is nice because you don’t have to wait for VNC software to boot. since it acts like a monitor and keyboard, you can even enter BIOS with it. JetKVM sells an extension board that you could hook up to your server motherboard’s power buttons to turn it on/off too.

for fully software solutions, i like using apollo on the server and moonlight on the clients. it’s built for game streaming, but it works for remote desktop too. i have apollo and moonlight installed on a bunch of my devices anyways so this saves me from installing an additional client most of the time.