Hello Stan and welcome to the Cow Audio Forum,
Omnis lavs are almost always preferred over cardioid lavs. Because they are placed closer to the mouth than a boom mic, they pickup the voice quite well, although a good boom mic in the right environment usually wins. You have to try both to see who the winner is.
The COS-11x is an excellent choice. The Countryman B6 is another.
Regards,
Ty Ford
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