I don't have any experience with either of these switches, but I keep hearing concerns that the 4:4 switch is not available yet, and how many people will need it to be able to add 105 to their system.
Is the 3:4 not cascadable? Could you not get the same configuration using two 3:4 switches (albeit at a higher parts count and cost)?
Is the 3:4 not cascadable? Could you not get the same configuration using two 3:4 switches (albeit at a higher parts count and cost)?