I went with Marky because I feel that even if his lyrics weren't amazing, He had a really good voice for what kind of music the band was playing. Luke's voice doesn't quite do it for me.
Obviously I'm biased, but I like Luke's voice more. I think the band meshed a little better with Marky, but this topic is about who's voice is better. Luke's far more melodic than Marky will ever be, quite honestly. He may not have the screaming down pat yet, but I was never too keen on screaming. I think their next album will be amazing -- since they'll be working together; last time the guys wrote all the music and then Luke came in and wrote lyrics. Marky's new band, State Of Mind, has me interested. They had a demo track on a station in Bakersfield, but that was the only time anyone heard from him. Supposedly State Of Mind is signed (or working on it), though. Personally, I think he needs to fix his private life before starting another band. Hopefully he did.