From Cassidy to a Cyclone
It depends on so many factors, none more than the setting. A cafe with a particularly loud sound system can end up destroying the chemistry of an interview. Sitting too close to a crowd of people can also be a total disaster.
I find that the best thing to do, but it is also the most difficult, is to meet people in their own environment. I conducted a lot of interviews with Kevin Cassidy of Donegal on the move, with him driving me around some of the most scenic parts of Gaoth Dobhair, blathering away about everything under the sun.