One thing I discovered when I was trying them out is that they all work better when you do the figure of eight, as seen in the Best Compass Calibration Method.
I like Ulysee Gizmos because it has a bunch of cool functionality:
1) Compass with analog and digital readout, with both magnetic north and true north. Also lets you set a heading. Waypoints, and exchange waypoints.
2) Gives longitude, latitude, altitude, and address (if available).
3) Bubble level.
4) Inclinometer.
5) Speedometer.
6) Magnetometer.
7) GPS satellite tracker. (Shows location and color-coded signal strength of visible satellites on a compass so you know if your phone can actually receive adequate GPS satellite signals.)
8) One-click to map view.
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