It's more a matter of style. In a good SLR you can see 100% of what will be on your image - no more no less. However in almost all RF designs you are able to see more than what is on the image and will not have a blackout at the instant of shooting.
Like many things in this world (Harley vs. Triumph, Colt vs. S&W, Islay vs. Highland whisky, etc) it has far more to do with personal tastes than anything quantifiable.
I don't really prefer any style over any other. Look at my list in my .sig and you'll see my tastes. About the only thing you'll be able to tell is that I like Canon, Graflex & Zeiss... 😉
William