I decided to give Google Stadia a try, as you can have the first month of Pro for free, and an app recently launched for my TV so I could just use one of my Bluetooth controllers to try it out for nothing.
I'm really impressed with how well it performs, I thought lag would kill 4K game streaming, but it works almost prefecture on my 35Mbps connection.
Not such a big fan of their pricing model though - paying full price for games seems mad.