For egg volumes of 1 million or fewer, the JB model is usually the best choice. If eggs are taken over an extended period (such as 3-4 months) purchasing may be more economical than renting. For a short egg season with limited numbers, it is usually more economical to rent.
For egg volumes of 3 to 10 million, the JX or JM4 models would be appropriate.
For egg volumes over 10 million, the JM8 would work best.
Usually with volumes of 5 million or more, purchasing is more economical.