Jack is on the money there.
I too have Power FC, piss easy to fit and tune, I don't have any probs with mine, the reason I went for PFC was the ability to tune without o2 sensors. Mine is my only car, no idle issues or anything, I daily drive mine in traffics and such.
Knock control may be useful but I can't see a point in having one, best knock control is to lift your right foot off the pedal.
As Jack said, talk to tuner you prefer and ask him/her what they recommend or happy to tune with.