An easy way to download and maintain them is by using the ProtonUp app. I personally keep Experimental by default in Steam and switch to GE for specific titles when necessary, as Experimental hotfixes can roll out quicker than GE updates. Some people argue that it is better to use GE because he updates DXVK etc. to the latest versions but you can also opt into the bleeding edge branch of Experimental in Steam by searching for Proton in your library, right click and go into its properties and then to Betas.