I have used both types. Both are great. Bill Maxwell himself will tell you that the matte-only is brighter, but that both are bright enough. That has been my experience. I think they are both easy to focus and both an improvement on the stock screen. I personally like a split image microprism, so for me it was worth the (very slight, nearly imperceptible) brightness decrease to have that focusing aide. I liked it. That said, I currently have a matte-only screen with grid lines, and it's great too.
Be careful. This is solely a matter of personal taste. So you will find people who swear up and down that their preference is the only right choice. But in truth it comes down to what you like. Pepsi or Coke.