All I use a clip-on for is to get one string up to pitch, preferably the G. Once that's done, I rely on my ear.

No matter what tuner you use, you'll need to fine tune by ear to some degree.

To help me tap tune my banjo head, I use the red Snark. Why? Cos of its sensitivity. No other tuner (I know of) will register the note heard behind the tap, but the red Snark does it very well.

Cheers
-F