If you are job hunting, you should send your resume to recruiters.
Different recruiters know about different positions.
They do not usually know about the same ones. This is particularly true with retained firms. By sending your resume out widely, you will be placed in many different confidential databases and be alerted of many different positions. If you send your resume to only a few, it may be that none you send to will be working with positions which are suited for you. Throw your net widely.