I too tried KVM switches and saw they have not changed much in 15 years. No support for higher video modes. Buggy.
So I got a USB switch and that worked well for a while with multiple monitors (Dell) that you could assign shortcut keys to the buttons to switch inputs with 2 presses.
Now I have a curved Dell and it has a built-in USB switch that works really well that you can assign to inputs. It's a bit slow, switching USB takes as long as it does to switch video inputs, but it appears to be rock solid.
The other features, side-by-side and PiP are kind of a joke.
> switching USB takes as long as it does to switch video inputs
High-end KVMs get around this with virtual usb devices. Instead of switching the actual USB devices between computers A and B, they instead create a separate virtual USB device for each computer that always stays connected to each computer and is never switched. When you push the button on the KVM, you are not actually switching between computers, the KVM reads the USB input from the device and then recreates it on the appropriate virtual usb output device.
These KVMs are pretty costly. There are some complicated DIY solutions involving arduinos, but a software "KVM" (really just the KM, no V) like https://github.com/debauchee/barrier in most situations works just as well, and if the computers are connected via wired ethernet, is rock-solid and adds no perceptible latency.
So I got a USB switch and that worked well for a while with multiple monitors (Dell) that you could assign shortcut keys to the buttons to switch inputs with 2 presses.
Now I have a curved Dell and it has a built-in USB switch that works really well that you can assign to inputs. It's a bit slow, switching USB takes as long as it does to switch video inputs, but it appears to be rock solid.
The other features, side-by-side and PiP are kind of a joke.