Well fan controllers have both vdrop and vdroop...vdrop is constant regardless of the number of fans (i.e., the '12V' setting only at 10.5-11.4V with no fan, depending on the controller), but then you add in vdroop (dependent on load) and you can go down to ~10.3-10.85V with very high loads. Depending on the fans and the controller, putting three fans on one channel could be very high load, causing a low run voltage, which reduces performance more than if you just had one fan.
However....all three fans would still run at the same voltage, therefore perform similarly.
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