H-3 visas are complex and require more training than productive work ... not too attractive to employers.
There is no comparison to O, nor H-1B ... they are completely different. Plus, if someone qualifies for an O, or H-1B, they probably don't qualify for the H-3
Talk to an attorney ... he/she will probably recommend against the H-3.
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They are quite difficult to put together, one needs a training plan, training schedule, employment contract, letter of future employment confirmation in a higher position from an overseas company, and etc. The "training" has to be in a field not available in trainee's country.. And all of this for just a 1 year visa, renewable for only one more year. That's it. Employers only resort to this type of visa when desperate, especially when there are not going to be H-1Bs for a while. Much simpler and easier to get a J-1 training visa, whereas H-3 is first applied to the USCIS and once approves, then to the consulate overseas for the visa.
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Do your own research or consult an immigration attorney. This is too broad a question to be answered on this forum.
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