I know lots of guys love them. They never grew on me. I don't think one is necessarily better than the other. It's just some guys lose their mind if you don't do it their way.
I prefer solid guides. Especially since I was doing tons of Chrysler junk and I detest 3/8 stem valves. Although I'm using them in my heads. I still hate them. It's easier to run a core drill down there, ream to size and press in a guide with the correct ID. Hone to size and done.
Either or. If done correctly both are a good way of getting it done. I'm not as dogmatic as some.