JZBZ hands down. Can be placed flat between two frames while still allowing bees access through the side holes. No screen to accidentally peel off. Which one would you want to put in your shirt pocket? The queens can be a bit difficult to observe, though.
For shipping and installing queensiI like the jzbz. For hatching virgins in the incubator I use the California minis. Some folks I sell to want the 3 hole cages because they feel the jzbzs are to small for the queen and attendants, but I have never found that to be the case.
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