What I like about the dual extruder is the minimizing of time required to travel for a tool exchange.
After the first layer, there are two tool changes for each layer of the print. That’s a lot of additional wear on the machine and the added time for printing.
It seems like having two extruders mounted as closely beside each other as possible would be ideal. So long as the switching can occur internally while also minimizing overall weight of the assembly.
That Mark 2 looks slick regardless.