Considering purchasing a DE razor. Although my results using a supply 2.0 are really good, I feel like I'm missing something. Schick blades are great but maybe there's better shaves to be had. I'm really sorry if this has been gone over before. I couldn't find in search what I want to ask. I know the difference between open and closed comb razors insofar as what they look like an head design. That's about it. I am curious however, about the practical differences between the two in terms of performance, reasons to chose one over the other etc. I guess one came first and the over was invented for a reason. Thanks in advance for replies.