Audio Control, without a doubt. They have been designing these things quite a bit longer than the other two mentioned companies. and have also won more awards in design.
Really it depends on the model you get to determine signal dispersion, typically- if there is only 1 input and 3 outs- the signal would be transfered to all 3 outputs. However, if there is more than 1 input, the outputs are likely separated also.
take it easy,
-zane