I would recommend the I-beam as being the only one that works reliably without feedback, bark, quack, hum or distortion and yet is very easy to install and needs no holes drilled at all (though a tail pin jack is better than a trailing lead if you can run to that). There are better pick-ups but this is the most bomb-proof and unrivalled for price quality and ease of use.
Richard said they're quiet. Yes the passive ones are (though maybe loud enough for your purposes), but not the active. The amp is built into the end pin (so you do need that one hole) and the result is unerringly superb. Recommended to me by Chris Newman, I had one in the No 2 Martin for years (still in it, I assume) and always got great results through PAs big and small and even backline amps on occasion.